I remember a bank that gave away a free "pocket calculator" in the 1970 (when electronic calculators were a couple of hundred dollars). It was a slide calculator - and surprised the recipients! Until seeing this video, I assumed the free calculators were wheel-based (and some were, I am sure). Thanks for showing this.
🏦 _„Join us and get a _*_Free_*_ pocket calculator!“_ 😀 ✉ _Customer opens parcel: Sees slide calculator - And a lot of disappointment - Inside._ I assume you're a Barclays customer too, then? 🏦🇬🇧😉
it wasn't until you demonstrated how the carry mechanism works with the hook motion I realised just how clever this device is. Amazing piece of engineering!
As a school boy in the 1960's, I had one of the very device you demonstrated that my parents gave to me as one of my Christmas presents. The trouble was that my second grade teacher absolutely forbade the use of these devices in class! She likened it to a form of cheating and required all work be shown and done in pencil. Oddly enough she taught us how to use an abacus later that year. Not really that much different from one of these marvelous inventions.
@@miscbits6399 The ancient Romans had miniature hand abacuses with sliding beads built into the frame. They could have easily made a Troncet-style adder except that they didn't have a place-value numerical system that would accommodate them.
I have an Addiator Duplex (addition and subtraction) from the 1950s (I think) that I use on a regular basis. You can perform calculations quite quickly when you get used to it. I also have a couple of miniature (6-inch) pocket slide rules with Addiators built into the back side, made by Faber-Castel. One is a special slide rule for electrical calculations. I'm fascinated by these kinds of devices.
Thanks, as an Engineer trained in the 1960s we of course used our "guessing stick", AKA, the slide rule, which I suppose was a simple mechanical device, based on logarithmic scales. When electronic calculators appeared circa 1970 they were very expensive and I was still faster with a slide rule, but of course nowhere near as accurate. I also lived through using hand punched cards/tape and Fortran.
The first pocket calculator I got came with a sports coat that I purchased at the JC Penny store in my home town. I needed it for testifying in court as I was a cop at the time and the courts decided we should not appear in uniform because it gave the jury the impression they should always trust a man in uniform. Boy has that changed now days.
In the navy in the 1960s I was on a Submarine Tender, a supply ship for submarines,. I worked in a stock room and I was tasked with filling orders from stock. The orders were on punch cards and we were forbidden from folding, spindling or mutilating. Sadly I did that to an order that I filled. I was used as an example a couple days later. 😮
Over the course of millennia, we evolved from the abacus to this lovely little device: a pocket abacus with extra guides for ease of use. Then in a matter of decades we got electronic calculators that can perform trigonometry in an instant; just a handful of years later, everyone has a pocket function plotter built into their telephones. This really puts into perspective just how revolutionary electronics have been in such a minuscule time!
And if you look inside the processor chip on a microscopic scale, what the machine is doing is essentially abacus operations with electric charge, though in binary rather than decimal.
Thank you for doing the history on these ultra simple mechanical adding machines. We had one of those same Magic - Brain Calculators (except in the red plastic body) growing up in the mid 1960's. My dad's career was banking so, a large motorized mechanical adding machine was a regular sight (which made quite the racket when the Total button was pressed). With my interest in math, I was amazed how small and simple these devices were. I did noticed the slides were quite sloppy in movement though but, assumed this was normal. Later, in 1971 I started engineering in high school and the calculating tool of choice was the slide rule. In 1973, the $100 price barrier was broken on 4-function calculators so, within 2 - 3 years scientific calculators obsoleted the slide rules.
I had one of these as a kid in the sixties. They could also be used for simple multiplication and division using the addition and subtraction repeatedly and counting the sequence before being left with the remainder. Good video and memories, thanks.
As someone else mentioned, I had a Magic Brain that had a burgundy plastic back. I bought it around 1966 in a toy store I frequented on weekends whenever my paper route showed a profit… so… not really that often, but I spotted the Magic Brain perched in a rack with a dozen others right by the cash register and knew instantly I must have one, after I had bought the thing I had already saved up for, whatever it was, I’ve forgotten, I did. It came in a flimsy and fairly plain white cardboard sleeve with an even flimsier and faint sheet of instructions to operate what I then considered to be my first computer. I could easily out-calculate it up to four or five digits, even at ten years of age, but it was super-useful for serial addition and subtraction - adding and subtracting columns of numbers like credits and debits. My first computer.
As a kid I got one of these made of plastic and thin metal, around 1975 when I already had a calculator (which still works). I got quite good at basic calculations with it. Lost it somewhere over the years though.
Given the difficulty of making modern computers understand £sd: If we do reverse decimalisation - Which would be very on-brand for our present Conservative government - We're probably going to have to order in a *lot* of these things so folk can work out what the bally-'eck a _Shilling_ is! 💷🇬🇧😉
Remember playing around with a 'magic brain' in grade school back in the 60's. A friend had brought it in and we all "ooo"d and "ahhh"d over it. I had long forgotten this until watching your video. Fun walk down an old memory.
This channel remind me of Technology Connections, from the choice of topic (random everyday stuff of the old days), the way it was presented, the way the room is set up with a bunch of random yet nicely arranged clutters in the background, down to the unusual choice of wearing very formal clothing. Hopefully this channel will be just as successful soon.
Oh man, I had one of those Magic Brain calculators when I was a kid in the early '70s. I remember I had a lot of fun with this until my parents got me an electronic calculator. I liked playing with that as well, more so than with my dolls. I was a weird kid.
My father had a Record addiator I played with it without understanding when I was very young. Today I have a Meta, it was a big success when my son brought it to a school fair on a stand of old objects. Incredible how the young got attracted to it and used it without problem the teacher told me.
I had one of these (not necessarily "Magic Brain" branded), back in the early 1970's. I was a kid and our relatives in England used to send us presents in occasional parcels in the mail. Often things not easy to get in New Zealand. I had it for quite awhile but lost track of it decades ago. It came with a little stylus, similar to a piece of broken knitting needle, which I think I used after losing the original stylus that came with it.
I had a Correntator which was engineered for Imperial weights (oz, lb, cwt etc). Incredibly specific, but in its place, I think, more useful than the simple decimal type. Decimal addition and subtraction are relatively easy to do in your head, but the multiple bases needed for this is a bit brain bending.
My father had one similar calculator, all stamped metal. He used it for our farm book keeping to the end of his life. Although he had a marvelous ability to do the calculations in his head. I inherited some of the in-head math capability, while my brothers did not, or at least not as well as I did. When our father died, one of my two brothers took over the book keeping. By then I had bought myself a second hand rotary calculator for my studies. Even later I gave that manual rotary one to my brother for his book keeping help, as I had just purchased oneHP-35 electronic pocket calculator that did much more than just the 4 basic operations. I needed logarithms and trigonometric functions in my engineering profession. Besides the adder calculator my father had also a business oriented slide rule. I don't know what my brother did eventually to the Brunsviga mechanical calculator. I know he kept it at least some years after we had sold the farm and he did not need it for the farm book keeping any more. The simple adder almost certainly was discarded already before the farm was sold. Such memories, however, still remain in my otherwise overloaded head 😊.
We had one of these in our family in the 1960s. My mother was the bookkeeper for the small family business, and this was her first "calculator", known back then as an "adding machine." Later she got a much improved but still mechanical "adding machine" with levers instead of open slots for the push-stylus that actuated the earliest toy-like machine. Both the cheap one just like this, which at first glance seemed to be a toy, and the newer professional-looking model made by a different company were accurate and durable, so Mom must have been using one of the high quality versions. The newest model was about the size of a large grapefruit, and was much easier to operate due to using self-returning levers instead of a stylus to move the counters. Years later Mom switched to an electric adding machine which printed out the results on a roll of thermal paper, which helped her to double-check her input. But that 'toy' mechanical adding machine stayed in the family for many years, eventually disappearing into the void of some desk drawer, never to be seen again, like the Ancient Mariner's lonely Lost Sock we never could find, either.
We had one of these in a drawer when I was a kid, which I totally forgot about. I don't think we knew how to use it. Thanks for the trip down memory lane
I remember when I first saw one of these. Around 1962, Mr. Johnson, my sixth grade homeroom teacher pulled one out of his pocket to calculate something. I bought my first electronic "pocket" calculator fifty years ago in 1973. It was a basic, four-function calculator that cost $99, which is over $680 in 2023 dollars.
When you opened it up I thought this vid was gonna be about a fake calculator toy, and was genuinely taken aback when I realized you were going to show it could actually calculate. This is a pretty cool little device.
I got one of these types of calculators from my father in the mid 60s and used it occasionally until graduating high school in 1973 when he gave me one of the earliest HP35 calculators (he was a TV engineer and through his business connections had a significant discount with HP, as I recall) as a graduation present to take with me to go to MIT.
I remember playing with one of these when I was a kid. Didn’t use it much once I started learning how to use a slide rule, which was quickly replace with the wedge shaped Texas Instruments TI-30 calculator. I actually wore to buttons out on a TI-30 while undergoing the Navy’s nuclear power training (lasting almost two years) so I could sit on a submarine and stare at the meters on a reactor plant control panel.
A late friend of mine was an architect and used one of these all the time. Mostly to make fun of calculators. He could calculate feet and inches faster than with a calculator and was always up for a race. I don't know what particular one he had but it was silver and a stylus or pen was used to move the tracks. Wonderful things.
This is a funny thing actually: Living in a country that prefers Imperial but (Up until a few years ago) was obliged to honour Metric, I've found myself working out and learning the decimal conversion factors between Metric and Imperial, and can now mentally convert and run these through a calculator almost instinctively now. 🇬🇧💱🇪🇺 I guess this is a natural outcome of growing up in an all-Metric world and then suddenly finding your country leaving that trade union which kept it supporting the Metric system for the entirety of your life... 🙃
I had one of these as a child in 1967 or so.. It was stamped metal, very cheap, and looked identical to the one used in this presentation.. I remember that part where when adding numbers, one had to continue the stylus movement to click over to the left, moving that column one number, the 'carry over' function in addition.. Lost to the sands of time, I have no idea what happened to it.
My goodness! I never thought I would ever see one of these again. I bought one off a school friend for $1 when I was 12. Unfortunately it broke after a while and decided to make something that basically worked the same way. I made it out of knitting counters. You know the ones you put on knitting needles to count the number of rows that you knit. What I did was buy 4 of them, they were 2 digits each, and glued them onto a short length of knitting needle. With a bit of practice I could use it to add and subtract up to 8 digits almost as quickly as with your little device.
Well I've watched a few in quick succession and among many other things I've found it that your work is addictive. Clean, logical and well presented. Glad I subbed an hour ago! Keep it up, Gilles!
I had one of these as a kid in the 1970s. I bought it through a comic book ad. I lost it at some point, but recently found another one at an estate sale. The original one I had was exactly like the model shown in the video, but the one I have now has a more elegant gold and white design, and just says "CALCULATOR" instead of "MAGIC BRAIN CALCULATOR".
it is always a good day when i learn a new word, thank you for this- rabdology (uncountable) (arithmetic) The practice of performing arithmetic using Napier's bones.
My grandfather gave me a little mechanical calculator. He used it often but it still works well. The brand or model is "Curta" and it looks like a pepper mill 😆great little thing though. Also got an "Addometer" that is quite similar, though much longer, and the use of wheels is much more obvious.
The Curta calculator is very well remembered among vintage computer nerds. If you ever run into abacus and slide rule fans, they'll happily talk your ear off about it. I hope you take good care of it.
I vividly remember the Chadwick model. We had one in our household and I would play with it as a kid, and I'm pretty sure I learned how to make it work. The world used to be full of mechanical things like this when I was young and electronics hadn't yet taken over. If you can get hold of one, you should do a video about the "Digi-Comp I", a simple mechanical "digital computer" from the early sixties made of plastic, metal rods, rubber bands, and cardboard which you could program with plastic pegs.
I remember playing with one of these as a kid. My father used to have calipers, slide rules, mechanical calculators and other similar tools from his college days mainly stored in the drawer where we used to keep bills and such. I don’t know how many of those I probably abused pretending they were spaceships or other random things.
Making something complex in a remarkably simple form is far more impressive and the mark of a truly intelligent mind than simply making something complex.
Fascinating. This might have a nice application today in teaching low level software developers about twos-complement arithmetic, since that is still the most common way addition is implemented in hardware.
Oh wow. I'd forgotten all about these. Had one when I was younger. Also, back then I could use a slide rule for basic math as well. Still have the slide rules. And I remember when my dad brought home from work one of the first mass produced desktop calculators. It was huge and had small tube lights for the numbers. Thanks for the memories.
I fell into the gap where slide rules usage were no longer being taught and electronic calculators were still not cheap enough for general use. The first i saw was an early adopter who had one of sinclairs strange calculators with its reverse polish notation. We did do a couple of sessions on the mechanical rotary adding machine in primary school, to prepare us for the future😊
I used to have one of those as a kid in the 80's. I preferred using it to a regular calculator, since the fact that it was entirely mechanical made it seem cool and unusual.
I have an 'Exactus' sliding calculator and it is my favourite portable mechanical calculator. The Comptometer would usually take that category but it is a little on the large size to fit in a pocket 😄
One of those showed up at our house, sometime in the 1960s. I think it came from a neighbor who moved away after his wife died. I don't remember any brand name on it, and nobody really used it-- my dad had a mechanical adding machine that he used for his insurance job. I used to fiddle with the "magic brain" one. I don't know when it disappeared from our house. It was kind of fun to play with.
I still have the one my Grandfather used when I was a youngster. But it is made of green painted metal with a row of rotary dials like a telephone and a row of square box windows at the top that displays the numerals that are entered with the dials. I used to love playing with it back in the 70,s .My Grandfather is probably the reason I have always been fascinated with maths.
Same here, except mine is in a box in the garage since last time I moved. It was more of a novelty than a useful item, since it fell on my lap from older family years after pocket calculators were already a thing.
Wow this brought back memories. I had same one, used it heaps. I think I still have it. I have one with the calculator and slide rule combined as well.
Complements are being used a bit differently in the Magic-Brain than they are in, say, a Comptometer. If you look closely at one of those, the complementary digits provided for subtraction are nines' complements: every subtraction digit is 9 minus the regular digit. Here, they're tens' complements. The reason is that the Comptometer has an automatic carry mechanism that always operates in addition mode. To subtract, you add the 10^n complement of the *entire multi-digit number* according to the formula in your video. As it happens, that's the nines' complement of every individual digit, except that you add 1 at the end. And, as you said, you have to suppress, undo or ignore the final carry. Here, subtraction is done with the tens' complement of every individual digit. That works because the Magic-Brain can just have you do the carry differently. And it means there's no special funny business with having to add 1 or ignore the final carry. Much easier to explain.
Mine came as an Xmas gift in '63 from the Sunset House at the South Bay Center in Torrance. 'Nuff said for those who remember. Stayed with me 'til the late 80s at least.
I had one of these, as a kid, in the 1960s. It broke, and was tossed, in less than a year. Didn't appreciate complements until the 1980s, when using them in digital electronics classes, in college. Some early microprocessors didn't have a subtract instruction, but used 1's complement (inverting), but by adding one, gave you 2's complement, which would give the equivalent of subtraction. My first electronic calculator was a TI SR11 (LED), which cost me ~$30, in 1975. It was replaced by a cheap Sharp scientific (LCD) calculator, during college, for ~$20, which had many more functions. I think both could display numbers in scientific notation. Important, if you're taking engineering classes. I think the Bomar Brain cost ~$400, in the early 1970s, which was the first electronic calculator aimed at the consumer market. You could buy a working used car for that money, back then.
Did you know that there is a way to compute a sqrt() on one of these although it is easier if you have two of them to work with. The method works from 2 facts: 1) The sum of the first N odd numbers is N^2 eg: 1+3+5 = 9 2) If you multiply a number by 10 its square goes up by 100. Basically you need to keep track of the next odd number to subtract and what remains after the subtraction. To do this with just one calculator, you use the left sliders for the remains and the right one for the "N". The odd number is (2N-1)
I have several different types of these old devices. I think mine were from the 50-60s but Ive not looked them up online. Never knew the history of them, thanks for the history lesson! Edit- I think my mom used them for crocheting or knitting large items
My father had something quite similar, but made all in metal and green and gold in colour. Oh and it worked in British pre-decimal currency 12 pennies to the shilling, 20 shillings to the pound. Can't remember if it coped with ha'pennies and/or farthings (2 ha'pennies to the penny, 2 farthings to the ha'penny)
I had one of these, or something very similar,when I was a kid in the early sixties. I had completely forgotten it. It was fun and fitted in my shirt pocket. I think my parents saw it as an educational aid ;-)
In the late 60s, I had one with the box and instructions. I kept it in the glove box of my mothers 63 Ford Mustang. I used it for math homework, but I don't remember how to divide with it. I lost the original, but I recently bought another one!
My father had a mechanical calculator (bought by Bell Labs) that was motorized It had 3 sets of pushbuttons to replace these slides. You could do, addition, subtraction, multiplecation, division and powers. Some problems might take 10+ minutes to calculate, making for some interesting beats.
I had something very similar but even more compact. In fact I still have it, it cost me six shillings and sixpence back in the day. I graduated onto a slide rule in high school and then one of the first texas instrument calculators.
I remember these being sold on dime-store racks in the 1970s when I was a kid and electronic pocket calculators already existed (but were not yet cheap). I have one somewhere, in relatively good shape--my mother-in-law gave it to me when she found it among the items in her father's estate. You can think of it as a miniature abacus, with some mechanical hints to help you with the manual carrying. I suppose that for this kind of device to be refined from the abacus, you need an environment where Arabic numerals with place value are commonplace (so the notational system matches the abacus), and those weren't widely established in Europe until the 16th century, though I could imagine these being dreamed up in India or the Arab world much earlier if not mass-manufactured. Napier's bones weren't so much like a slide rule (though those were also based on other work of Napier); they were more like a multiplication table that you can cleverly rearrange into the stuff below the line in a long-multiplication operation. Digital rather than analog. I suppose if you combined those with a slide adder you could automate most of the operation.
I had one as a kid. I ~WISH~ I had taken care of it. I didn't appreciate the old man's slide rule at the time either, now I collect them. I would love to see a company make simple slide rules for kids to use in schools, the A/C/D/K scales on top and a pair of number lines on the bottom for addition and subtraction.
I have a Magic Brain, and another similar device, the Exactus, which is smaller. I am in the UK, and the Exactus is for the old British currency of pounds, shillings and pence: 12 pence make 1 shilling, 20 shillings make 1 pound. A penny could be divided into 4 farthings, and the Exactus handles farthings as well. It was exciting to set up 9,999 pounds, 19 shillings, 11 pence and 3 farthings, and then add 1 farthing, propagating carries to make 10,000 pounds. For the record, the UK switched to decimal currency in 1971, with the pound divided into 100 new pence (instead of 20 * 12 = 240 old pence). I am now 80 years old and I bought these devices to use seriously. Back then, electronics was based on vacuum tubes, computers occupied whole rooms and required air conditioning, so home computers were just science fiction, and pocket electronic calculators were fantasy. Of course, I also have a couple of slide rules; one very fancy one with lots of different scales, and one that belonged to my father, who was an engineer in the Royal Navy.
I remember seeing these things for sale (or offered as a premium for selling magazine subscriptions or flower seeds) in the backs of comic books when I was a kid in the 1970s. The same ads that offered "X-ray specs" and subminiature spy cameras and sea monkeys.
You didn't show the coolest part--when you pull the handle on the top to reset the mechanism to all zeros! As a child I watched my parents use one of these when paying bills in the 1960s. When I was finally old enough to figure it out and could use it myself it felt like a big accomplishment. They are cool and fun devices.
My grandmother had one of these back around 1960 when I was a boy. I thought it was amazing. Thanks for explaining how it worked.
I remember we had one in the 1960's
@@savage22bolt32 I used to play with my Dad's "Magic Brain"...
@@savage22bolt32 I had one in the mid 1960s.
@@bennri you old coot - like me ❤🌞
I remember a bank that gave away a free "pocket calculator" in the 1970 (when electronic calculators were a couple of hundred dollars). It was a slide calculator - and surprised the recipients! Until seeing this video, I assumed the free calculators were wheel-based (and some were, I am sure). Thanks for showing this.
🏦 _„Join us and get a _*_Free_*_ pocket calculator!“_ 😀
✉ _Customer opens parcel: Sees slide calculator - And a lot of disappointment - Inside._
I assume you're a Barclays customer too, then? 🏦🇬🇧😉
it wasn't until you demonstrated how the carry mechanism works with the hook motion I realised just how clever this device is. Amazing piece of engineering!
As a school boy in the 1960's, I had one of the very device you demonstrated that my parents gave to me as one of my Christmas presents. The trouble was that my second grade teacher absolutely forbade the use of these devices in class! She likened it to a form of cheating and required all work be shown and done in pencil.
Oddly enough she taught us how to use an abacus later that year. Not really that much different from one of these marvelous inventions.
I was going to say that these are a flat implementation of abacus operating principles in a more portable form
@@miscbits6399 The ancient Romans had miniature hand abacuses with sliding beads built into the frame. They could have easily made a Troncet-style adder except that they didn't have a place-value numerical system that would accommodate them.
Reminds me at school in the mid 2000s when a teacher said you won't always have a calculator in your pocket
We all took out our phones
I have an Addiator Duplex (addition and subtraction) from the 1950s (I think) that I use on a regular basis. You can perform calculations quite quickly when you get used to it.
I also have a couple of miniature (6-inch) pocket slide rules with Addiators built into the back side, made by Faber-Castel. One is a special slide rule for electrical calculations.
I'm fascinated by these kinds of devices.
My mom used one for groceries shopping. I remember playing with it.
Thanks, as an Engineer trained in the 1960s we of course used our "guessing stick", AKA, the slide rule, which I suppose was a simple mechanical device, based on logarithmic scales.
When electronic calculators appeared circa 1970 they were very expensive and I was still faster with a slide rule, but of course nowhere near as accurate. I also lived through using hand punched cards/tape and Fortran.
The first pocket calculator I got came with a sports coat that I purchased at the JC Penny store in my home town. I needed it for testifying in court as I was a cop at the time and the courts decided we should not appear in uniform because it gave the jury the impression they should always trust a man in uniform. Boy has that changed now days.
I learned how to program in assembler before I "graduated" to Fortran. But I owned one of these Magic Brain devices too.
In the navy in the 1960s I was on a Submarine Tender, a supply ship for submarines,. I worked in a stock room and I was tasked with filling orders from stock. The orders were on punch cards and we were forbidden from folding, spindling or mutilating. Sadly I did that to an order that I filled. I was used as an example a couple days later. 😮
How does this channel not have hundreds of thousands of subs???
He'll get there. Gilles does amazing work. :-)
A true hidden gem
Over the course of millennia, we evolved from the abacus to this lovely little device: a pocket abacus with extra guides for ease of use.
Then in a matter of decades we got electronic calculators that can perform trigonometry in an instant; just a handful of years later, everyone has a pocket function plotter built into their telephones.
This really puts into perspective just how revolutionary electronics have been in such a minuscule time!
And if you look inside the processor chip on a microscopic scale, what the machine is doing is essentially abacus operations with electric charge, though in binary rather than decimal.
But what about the slide rule, and the Curta?
Thank you for doing the history on these ultra simple mechanical adding machines. We had one of those same Magic - Brain Calculators (except in the red plastic body) growing up in the mid 1960's. My dad's career was banking so, a large motorized mechanical adding machine was a regular sight (which made quite the racket when the Total button was pressed). With my interest in math, I was amazed how small and simple these devices were. I did noticed the slides were quite sloppy in movement though but, assumed this was normal. Later, in 1971 I started engineering in high school and the calculating tool of choice was the slide rule. In 1973, the $100 price barrier was broken on 4-function calculators so, within 2 - 3 years scientific calculators obsoleted the slide rules.
I had one of these as a kid in the sixties. They could also be used for simple multiplication and division using the addition and subtraction repeatedly and counting the sequence before being left with the remainder. Good video and memories, thanks.
As someone else mentioned, I had a Magic Brain that had a burgundy plastic back. I bought it around 1966 in a toy store I frequented on weekends whenever my paper route showed a profit… so… not really that often, but I spotted the Magic Brain perched in a rack with a dozen others right by the cash register and knew instantly I must have one, after I had bought the thing I had already saved up for, whatever it was, I’ve forgotten, I did. It came in a flimsy and fairly plain white cardboard sleeve with an even flimsier and faint sheet of instructions to operate what I then considered to be my first computer. I could easily out-calculate it up to four or five digits, even at ten years of age, but it was super-useful for serial addition and subtraction - adding and subtracting columns of numbers like credits and debits. My first computer.
As a kid I got one of these made of plastic and thin metal, around 1975 when I already had a calculator (which still works). I got quite good at basic calculations with it. Lost it somewhere over the years though.
I remember having one of those operating in pounds, shillings, and pence. It was an ingenious device that was surprisingly quick to use.
Given the difficulty of making modern computers understand £sd: If we do reverse decimalisation - Which would be very on-brand for our present Conservative government - We're probably going to have to order in a *lot* of these things so folk can work out what the bally-'eck a _Shilling_ is! 💷🇬🇧😉
Remember playing around with a 'magic brain' in grade school back in the 60's. A friend had brought it in and we all "ooo"d and "ahhh"d over it. I had long forgotten this until watching your video. Fun walk down an old memory.
Just a grammar correction. The strips are not corrugated (like a wavy potato chip), they're serrated (like a cutting blade).
This channel remind me of Technology Connections, from the choice of topic (random everyday stuff of the old days), the way it was presented, the way the room is set up with a bunch of random yet nicely arranged clutters in the background, down to the unusual choice of wearing very formal clothing. Hopefully this channel will be just as successful soon.
Wow, a blast from the past! I had one 52 years ago in 1971!
Oh man, I had one of those Magic Brain calculators when I was a kid in the early '70s. I remember I had a lot of fun with this until my parents got me an electronic calculator. I liked playing with that as well, more so than with my dolls. I was a weird kid.
My father had a Record addiator I played with it without understanding when I was very young. Today I have a Meta, it was a big success when my son brought it to a school fair on a stand of old objects. Incredible how the young got attracted to it and used it without problem the teacher told me.
I have a "Produx Original" with "Made in Germany - West" stamped on the back. It was a gift to me from a very thoughtful friend.
I had one exactly like the one in this video in the early 70s. I loved it! I blew my mind to see this device again for the first time in decades!
It's like being 11 years old again, I bought mine from the back of a comic with one of those "Make yourself a genius advert".
@@ooslum Same here! I think I was 11 or 12, but I don't remember where I got it from. It's weird to see something again after half a century (for me).
I had one of these (not necessarily "Magic Brain" branded), back in the early 1970's. I was a kid and our relatives in England used to send us presents in occasional parcels in the mail. Often things not easy to get in New Zealand. I had it for quite awhile but lost track of it decades ago. It came with a little stylus, similar to a piece of broken knitting needle, which I think I used after losing the original stylus that came with it.
I had a Correntator which was engineered for Imperial weights (oz, lb, cwt etc). Incredibly specific, but in its place, I think, more useful than the simple decimal type. Decimal addition and subtraction are relatively easy to do in your head, but the multiple bases needed for this is a bit brain bending.
My father had one similar calculator, all stamped metal. He used it for our farm book keeping to the end of his life. Although he had a marvelous ability to do the calculations in his head. I inherited some of the in-head math capability, while my brothers did not, or at least not as well as I did. When our father died, one of my two brothers took over the book keeping. By then I had bought myself a second hand rotary calculator for my studies. Even later I gave that manual rotary one to my brother for his book keeping help, as I had just purchased oneHP-35 electronic pocket calculator that did much more than just the 4 basic operations. I needed logarithms and trigonometric functions in my engineering profession. Besides the adder calculator my father had also a business oriented slide rule. I don't know what my brother did eventually to the Brunsviga mechanical calculator. I know he kept it at least some years after we had sold the farm and he did not need it for the farm book keeping any more. The simple adder almost certainly was discarded already before the farm was sold. Such memories, however, still remain in my otherwise overloaded head 😊.
Thank you for an interesting insight.
The explanation made my brain ache, but this is such a clever, mechanical device. Never heard of them before but I'm a 80s calculator kid!
I've got one of those from my grandfather over 40 years ago. I remember him showing me how to use it but I'd long forgotten. Thanks for reminding me.
We had one of these in our family in the 1960s. My mother was the bookkeeper for the small family business, and this was her first "calculator", known back then as an "adding machine." Later she got a much improved but still mechanical "adding machine" with levers instead of open slots for the push-stylus that actuated the earliest toy-like machine. Both the cheap one just like this, which at first glance seemed to be a toy, and the newer professional-looking model made by a different company were accurate and durable, so Mom must have been using one of the high quality versions. The newest model was about the size of a large grapefruit, and was much easier to operate due to using self-returning levers instead of a stylus to move the counters.
Years later Mom switched to an electric adding machine which printed out the results on a roll of thermal paper, which helped her to double-check her input. But that 'toy' mechanical adding machine stayed in the family for many years, eventually disappearing into the void of some desk drawer, never to be seen again, like the Ancient Mariner's lonely Lost Sock we never could find, either.
My dad had a couple of these when I was a kid (ca 1970-ish). I never really understood them until now. Thank you!
We had one of these in a drawer when I was a kid, which I totally forgot about. I don't think we knew how to use it. Thanks for the trip down memory lane
I was not prepared for that incredible fascinating lesson.
Wow, this brings back memories. I had one these when I growing up in the 1960s! Thanks! I haven't seen it in something like 55 years!
I remember when I first saw one of these. Around 1962, Mr. Johnson, my sixth grade homeroom teacher pulled one out of his pocket to calculate something. I bought my first electronic "pocket" calculator fifty years ago in 1973. It was a basic, four-function calculator that cost $99, which is over $680 in 2023 dollars.
When you opened it up I thought this vid was gonna be about a fake calculator toy, and was genuinely taken aback when I realized you were going to show it could actually calculate. This is a pretty cool little device.
I got one of these types of calculators from my father in the mid 60s and used it occasionally until graduating high school in 1973 when he gave me one of the earliest HP35 calculators (he was a TV engineer and through his business connections had a significant discount with HP, as I recall) as a graduation present to take with me to go to MIT.
I had one of these as a kid around 1970. It proved to be very useful for simple arithmetic calculations.
As always fantastic content. I feel lucky the TH-cam algorithm got me to the great channel, hope others get lucky as well soon. Deserve so many subs
I remember playing with one of these when I was a kid. Didn’t use it much once I started learning how to use a slide rule, which was quickly replace with the wedge shaped Texas Instruments TI-30 calculator. I actually wore to buttons out on a TI-30 while undergoing the Navy’s nuclear power training (lasting almost two years) so I could sit on a submarine and stare at the meters on a reactor plant control panel.
I had one of these. It must have been late 60s or early 70s. I forgot all about it. Thanks for the memories!
A late friend of mine was an architect and used one of these all the time. Mostly to make fun of calculators. He could calculate feet and inches faster than with a calculator and was always up for a race. I don't know what particular one he had but it was silver and a stylus or pen was used to move the tracks. Wonderful things.
This is a funny thing actually: Living in a country that prefers Imperial but (Up until a few years ago) was obliged to honour Metric, I've found myself working out and learning the decimal conversion factors between Metric and Imperial, and can now mentally convert and run these through a calculator almost instinctively now. 🇬🇧💱🇪🇺
I guess this is a natural outcome of growing up in an all-Metric world and then suddenly finding your country leaving that trade union which kept it supporting the Metric system for the entirety of your life... 🙃
I had one of these as a child in 1967 or so.. It was stamped metal, very cheap, and looked identical to the one used in this presentation.. I remember that part where when adding numbers, one had to continue the stylus movement to click over to the left, moving that column one number, the 'carry over' function in addition.. Lost to the sands of time, I have no idea what happened to it.
My grandmother gave me one of those when I was a kid back in the 1960s. I’d forgotten all about it until I saw this video.
I had one of these in 1974, brilliantly simple, no bobberies required
It's much easier to understand complements in binary, I never really thought about using them in the decimal system and it's pretty cool.
Now, do a Curta calculator. All analog and would add, subtract, multiply, and divide. They were very popular with rally drivers in TSD rallies.
My goodness! I never thought I would ever see one of these again. I bought one off a school friend for $1 when I was 12. Unfortunately it broke after a while and decided to make something that basically worked the same way. I made it out of knitting counters. You know the ones you put on knitting needles to count the number of rows that you knit. What I did was buy 4 of them, they were 2 digits each, and glued them onto a short length of knitting needle. With a bit of practice I could use it to add and subtract up to 8 digits almost as quickly as with your little device.
My mother had one of those (Rectar brand Addiator) and now I keep it with loving care!
Well I've watched a few in quick succession and among many other things I've found it that your work is addictive. Clean, logical and well presented. Glad I subbed an hour ago! Keep it up, Gilles!
I had one of these as a kid in the 1970s. I bought it through a comic book ad. I lost it at some point, but recently found another one at an estate sale. The original one I had was exactly like the model shown in the video, but the one I have now has a more elegant gold and white design, and just says "CALCULATOR" instead of "MAGIC BRAIN CALCULATOR".
it is always a good day when i learn a new word, thank you for this-
rabdology (uncountable)
(arithmetic) The practice of performing arithmetic using Napier's bones.
My grandfather gave me a little mechanical calculator. He used it often but it still works well. The brand or model is "Curta" and it looks like a pepper mill 😆great little thing though. Also got an "Addometer" that is quite similar, though much longer, and the use of wheels is much more obvious.
The Curta calculator is very well remembered among vintage computer nerds. If you ever run into abacus and slide rule fans, they'll happily talk your ear off about it. I hope you take good care of it.
The Curta is far more complicated than this, and by now rare and worth several hundred dollars. Just don't open it up!
I vividly remember the Chadwick model. We had one in our household and I would play with it as a kid, and I'm pretty sure I learned how to make it work. The world used to be full of mechanical things like this when I was young and electronics hadn't yet taken over. If you can get hold of one, you should do a video about the "Digi-Comp I", a simple mechanical "digital computer" from the early sixties made of plastic, metal rods, rubber bands, and cardboard which you could program with plastic pegs.
I remember playing with one of these as a kid. My father used to have calipers, slide rules, mechanical calculators and other similar tools from his college days mainly stored in the drawer where we used to keep bills and such. I don’t know how many of those I probably abused pretending they were spaceships or other random things.
Making something complex in a remarkably simple form is far more impressive and the mark of a truly intelligent mind than simply making something complex.
We had a magic brain calculator when I was growing up; I was always fascinated by its simplicity of operation.
I had one of these when I was a kid in the early 1970’s loved it.
I have a similar one of those, Where you do addittion on one side and flip it to the backside to do Subraction.
Fascinating. This might have a nice application today in teaching low level software developers about twos-complement arithmetic, since that is still the most common way addition is implemented in hardware.
You beat me to this comment
I remember seeing one as a kid. Thanks for the explanation!
Oh wow. I'd forgotten all about these. Had one when I was younger. Also, back then I could use a slide rule for basic math as well. Still have the slide rules. And I remember when my dad brought home from work one of the first mass produced desktop calculators. It was huge and had small tube lights for the numbers. Thanks for the memories.
I love the term Addiator and am going to use it exclusively from now on.
I have one of those. Mine’s red. Got it when I was a kid. Now I need to go play with it. It’s in a drawer at work. Wow!
Nice! I have the ARITHMA Addiator on my desk at work. You can still find nice examples of them on ebay for $20-$30, but I found mine at a garage sale.
I’ve got one - in perfect condition and works great. Even has the original instructions !👍
Please do a video on the Curta calculator - you will love learning about it.
I owned one of these. Thanks for the memories!
I fell into the gap where slide rules usage were no longer being taught and electronic calculators were still not cheap enough for general use. The first i saw was an early adopter who had one of sinclairs strange calculators with its reverse polish notation. We did do a couple of sessions on the mechanical rotary adding machine in primary school, to prepare us for the future😊
I used to have one of those as a kid in the 80's. I preferred using it to a regular calculator, since the fact that it was entirely mechanical made it seem cool and unusual.
I have an 'Exactus' sliding calculator and it is my favourite portable mechanical calculator. The Comptometer would usually take that category but it is a little on the large size to fit in a pocket 😄
I used to have one of those "back in da day". Had totally forgotten until I saw this video!
One of those showed up at our house, sometime in the 1960s. I think it came from a neighbor who moved away after his wife died. I don't remember any brand name on it, and nobody really used it-- my dad had a mechanical adding machine that he used for his insurance job. I used to fiddle with the "magic brain" one. I don't know when it disappeared from our house. It was kind of fun to play with.
I still have the one my Grandfather used when I was a youngster. But it is made of green painted metal with a row of rotary dials like a telephone and a row of square box windows at the top that displays the numerals that are entered with the dials. I used to love playing with it back in the 70,s .My Grandfather is probably the reason I have always been fascinated with maths.
I just found your channel from this video, and holy moly what a gold mine! Could you do the Curta next? Or Nagra SN?
I actually just acquired a Curta, but I'm going to build up to it by covering over adding machines first. I plan to make it my 100th video :)
I had one of those as a child, forgot about it until i saw it here. Must be getting old 🙂
I still have one of those in the desk drawer from when I was a kid. It wasn't really of much use but it did work (I still have the stylus too).
Same here, except mine is in a box in the garage since last time I moved. It was more of a novelty than a useful item, since it fell on my lap from older family years after pocket calculators were already a thing.
Wow this brought back memories. I had same one, used it heaps. I think I still have it. I have one with the calculator and slide rule combined as well.
Complements are being used a bit differently in the Magic-Brain than they are in, say, a Comptometer. If you look closely at one of those, the complementary digits provided for subtraction are nines' complements: every subtraction digit is 9 minus the regular digit. Here, they're tens' complements.
The reason is that the Comptometer has an automatic carry mechanism that always operates in addition mode. To subtract, you add the 10^n complement of the *entire multi-digit number* according to the formula in your video. As it happens, that's the nines' complement of every individual digit, except that you add 1 at the end. And, as you said, you have to suppress, undo or ignore the final carry.
Here, subtraction is done with the tens' complement of every individual digit. That works because the Magic-Brain can just have you do the carry differently. And it means there's no special funny business with having to add 1 or ignore the final carry. Much easier to explain.
Mine came as an Xmas gift in '63 from the Sunset House at the South Bay Center in Torrance. 'Nuff said for those who remember. Stayed with me 'til the late 80s at least.
I had one of these, as a kid, in the 1960s. It broke, and was tossed, in less than a year.
Didn't appreciate complements until the 1980s, when using them in digital electronics classes, in college. Some early microprocessors didn't have a subtract instruction, but used 1's complement (inverting), but by adding one, gave you 2's complement, which would give the equivalent of subtraction.
My first electronic calculator was a TI SR11 (LED), which cost me ~$30, in 1975. It was replaced by a cheap Sharp scientific (LCD) calculator, during college, for ~$20, which had many more functions. I think both could display numbers in scientific notation. Important, if you're taking engineering classes. I think the Bomar Brain cost ~$400, in the early 1970s, which was the first electronic calculator aimed at the consumer market. You could buy a working used car for that money, back then.
Did you know that there is a way to compute a sqrt() on one of these although it is easier if you have two of them to work with.
The method works from 2 facts:
1) The sum of the first N odd numbers is N^2 eg: 1+3+5 = 9
2) If you multiply a number by 10 its square goes up by 100.
Basically you need to keep track of the next odd number to subtract and what remains after the subtraction. To do this with just one calculator, you use the left sliders for the remains and the right one for the "N". The odd number is (2N-1)
Cool. My dad had one of these when I was a kid. I remember taking it to school when I was in grade school.
I have several different types of these old devices. I think mine were from the 50-60s but Ive not looked them up online. Never knew the history of them, thanks for the history lesson!
Edit- I think my mom used them for crocheting or knitting large items
I saw the thumbnail and realized that I had one as a child. Never figured out how to use it until now.
I have one of these, it is awesome. This and some Napier bones taught me math.
My father had something quite similar, but made all in metal and green and gold in colour. Oh and it worked in British pre-decimal currency 12 pennies to the shilling, 20 shillings to the pound. Can't remember if it coped with ha'pennies and/or farthings (2 ha'pennies to the penny, 2 farthings to the ha'penny)
PS it was a lot smaller than the one you have hear as I recall
I had one of these, or something very similar,when I was a kid in the early sixties. I had completely forgotten it. It was fun and fitted in my shirt pocket. I think my parents saw it as an educational aid ;-)
In the late 60s, I had one with the box and instructions. I kept it in the glove box of my mothers 63 Ford Mustang. I used it for math homework, but I don't remember how to divide with it.
I lost the original, but I recently bought another one!
My father had a mechanical calculator (bought by Bell Labs) that was motorized
It had 3 sets of pushbuttons to replace these slides.
You could do, addition, subtraction, multiplecation, division and powers.
Some problems might take 10+ minutes to calculate, making for some interesting beats.
I had something very similar but even more compact. In fact I still have it, it cost me six shillings and sixpence back in the day. I graduated onto a slide rule in high school and then one of the first texas instrument calculators.
I remember these being sold on dime-store racks in the 1970s when I was a kid and electronic pocket calculators already existed (but were not yet cheap). I have one somewhere, in relatively good shape--my mother-in-law gave it to me when she found it among the items in her father's estate. You can think of it as a miniature abacus, with some mechanical hints to help you with the manual carrying. I suppose that for this kind of device to be refined from the abacus, you need an environment where Arabic numerals with place value are commonplace (so the notational system matches the abacus), and those weren't widely established in Europe until the 16th century, though I could imagine these being dreamed up in India or the Arab world much earlier if not mass-manufactured.
Napier's bones weren't so much like a slide rule (though those were also based on other work of Napier); they were more like a multiplication table that you can cleverly rearrange into the stuff below the line in a long-multiplication operation. Digital rather than analog. I suppose if you combined those with a slide adder you could automate most of the operation.
I had one as a kid. I ~WISH~ I had taken care of it. I didn't appreciate the old man's slide rule at the time either, now I collect them. I would love to see a company make simple slide rules for kids to use in schools, the A/C/D/K scales on top and a pair of number lines on the bottom for addition and subtraction.
“That cheapness came at a cost.” Love it.
My father was accountant and I keep one of this calculator as dad´s ememberance, may be from 50´s.
I got one of these in 1975 or '76, in fact I used it at school a few times. In fact I might still have it somewhere in a box in the loft.
I am 57 and I remember I had one of those machines as a kid
I had this when I was a kid! I totally forgot about this.
I have a Magic Brain, and another similar device, the Exactus, which is smaller.
I am in the UK, and the Exactus is for the old British currency of pounds, shillings and pence:
12 pence make 1 shilling, 20 shillings make 1 pound.
A penny could be divided into 4 farthings, and the Exactus handles farthings as well.
It was exciting to set up 9,999 pounds, 19 shillings, 11 pence and 3 farthings, and then add 1 farthing, propagating carries to make 10,000 pounds.
For the record, the UK switched to decimal currency in 1971, with the pound divided into 100 new pence (instead of 20 * 12 = 240 old pence).
I am now 80 years old and I bought these devices to use seriously.
Back then, electronics was based on vacuum tubes, computers occupied whole rooms and required air conditioning, so home computers were just science fiction, and pocket electronic calculators were fantasy.
Of course, I also have a couple of slide rules; one very fancy one with lots of different scales, and one that belonged to my father, who was an engineer in the Royal Navy.
I remember seeing these things for sale (or offered as a premium for selling magazine subscriptions or flower seeds) in the backs of comic books when I was a kid in the 1970s. The same ads that offered "X-ray specs" and subminiature spy cameras and sea monkeys.
You didn't show the coolest part--when you pull the handle on the top to reset the mechanism to all zeros!
As a child I watched my parents use one of these when paying bills in the 1960s. When I was finally old enough to figure it out and could use it myself it felt like a big accomplishment. They are cool and fun devices.
Wow - I remember, wish I still had mine plus the original Rockwell calculators… Big green numbers & little rubber feet..