2:52 "I love that!" This right here is why this guy is a National treasure. He has an encyclopedia's worth of knowledge and wisdom, yet his love for engineering still gives him a child-like fascination with the nature of nature. It's infectious and makes me want to be as excited as he is. I hope to always have this sort of intrigue and wonderment about science for as long as i live.
The better you know your topic the clearer and simpler you can teach it. These videos are awesome and this gentleman obviously knows his stuff. You have another subscriber.
This guy has a really nice theme for his videos. Feels smooth and calming, yet lets you know that you're progressing through something significant. Really nice, when you think about it,
At the very least, just by wearing the glasses he’s got us discussing safety. This is what safety culture is all about. Doesn’t have to be perfect, because nothing is, but is on the forefront of our minds.
I loved that he also put the glasses on to burn the filament. Staying safe doesn't always have to take a lot of effort, but can save you a lot of pain (or worse) once in a while.
Lord thundering Jesus, does this guy make the best videos in the world or what? His presenter skills are excellent, his voice, tone, pacing, inflections, subject matter, and demonstrations are uniformly awesome. World class. He makes me revel in the engineering of things I'm not even interested in. Give this man a raise!
for the most part he is correct, however, not every filament is the same. I work in a plant that manufactures incandescent bulbs, and depending on the wattage the coil will vary in size and length significantly. from nightlight/christmas light bulbs to huge stadium lights, each coil is different. also, argon is not the only gas used. sometimes argon, nitrogen and xenon are used either in a mix or independently depending upon the light output desired. also, red phosphorus is used to coat the coil before it even enters the glass bulb, that way, when the bulb is ignited for the first time, the phosporous will destroy any contamination and oxygen that may have gotten inside.
+Brandon Waterman Okay this might be a lame question, but here goes- Why Tungsten? What's so special about this really difficult-to-use metal that makes it the suitable candidate for incandescent filaments?
Of all elements we have, tungsten is the only one capable of handling the high temperatures produced for prolonged periods of time while emitting enough lumens to be able to see.
I didn't know that producing the filament would be such a complicated process. There is one type of bulb that I find particularly interesting and it is the halogen bulb. I used to wonder what it is that makes it brighter and whiter than the regular bulb. What I found is that the halogen gas in the bulb makes it possible for the filament to endure a higher temperature without evaporating.
Another great video. Thanks. How many of you have gotten a burned-out bulb to come back to life by gently tapping it so that the broken filament fuses back together?
This is the first time I have seen Bill and this is absolutely wonderful. Thank you Bill :) What a wonderful teacher. (And I have had enough to know the difference lols).
Nice. Bill, these are the most professional youtube videos I know of. Bar none. And this vid goes to show how seemingly cheap everyday objects are actually quite difficult to make and only became affordable though much effort. Gives us hope that some very desirable technologies like solar PV and lithium batteries may well become more affordable and dominate the generation of electricity for powering your (LED) lightbulbs.
This is an incredibly well done video! Incandescent light bulbs are so popular, produce a pleasing spectrum of light compared to current LEDs and yet... are so wasteful. Is it that tungsten has a high resistance but the engineered wire is heated to a glow because the voltage forces the electrons to pass through?
I WATCHED YOUR ALL VIDEOS. THANKS SIR FOR SHARING AND DEMONSTRATING YOUR KNOWLEDGE IN SUCH A BEST MANNER WHICH HELPS IN BETTER UNDERSTANDING. MORE VIDEOS WILL BE APPRECIATED SIR.
As with many ideas, sometimes is not just about inventing something, but your ability to market it and sell it, that will ultimately earn you a footnote.
...so we made you a coil; and turned your coil into a coil; so you can pass voltage (which was down-stepped though another coil) through the coil of coils; so you don’t have an accident in the dark and have to coil over.
@goblend Those bulbs also are of a design that burns at a lower temp in a way the filament in them is more like what you'd find inside a vacuum tube. In newer bulbs they pushed up the temps to get a whiter light and switch from a vacuum in the bulb to argon to cut costs. Now there are long life bulbs they burn at a slightly lower temp which yields a more yellowish light and the filament has multiple supports to prevent it from breaking.
@CraigMerton I also heard that if you touch the bulb so that grease or dirt is left on the glass. The light will heat it and the heat will make the glass crystallize. When the glass crystallizes it will no longer be able to seal the gas since the crystal form is not gas tight which the amorph glass is.
"how the fuck are they gonna do that?" 1episode later "yeah, that is not how that works." also senku brings rocks in a bag, like WTF! at least make a fucking wheel barrow!
@alphabeets Yes, but you will notice that the lamp envelope gets bigger, too, so that the temperature of the glass stays about the same (more surface area). I made a boot drier out of an old Christmas tree lighting string with two lamps. The normal small 7-watt lamps melted the boot liner, but 7-watt lamps that were twice the diameter were cool enough not to damage the boots with the same amount of heat.
Maybe the most telling part of this video is how Bill stated the incandescent bulbs' days are numbered. LED bulbs are getting cheap; at the time of this post, they are outweigh their cost-to-life benefit. Yet it is so cool to see how something maybe you and I grew up on explained, and yet maybe one day we will show this to the future generation as an aside of how technology was when we grew up.
I find it fascinating the numerous steps it takes to produce materials like that. How in the world did they figure out the exact sequence and the exact ingredient of each step?
At a minimum... 1. Motivation for the project. (Imagination, vision) 2. Engineering prowess. (Technical mindset) 3. Scientific method. (Analytical and methodical discipline) 4. Grants, donations, capital (Commercial mindset)
and know i know about the coil within the coil i must rethink my life. nah. but srsly you just taught me something new and i'm glad for it. thanks man.
@CraigMerton Also note that low voltage (12V) halogen bulbs have a considerably thicker filament than high voltage bulbs and they glow at a higher temperature which is why they have a whiter light than high voltage halogen bulbs that have come to the market recently.
@CraigMerton The gas in a halogen bulb reacts with the evaporated metal as soon as it leaves the filament. When the metal-halogen gas touches the glowing filament, the heat from it breaks the molecule and deposits the metal back on the filament.
A rather new invention is the sulphur lamp or daylight lamp which is an incandescent lamp. What's remarkable about this lamp is that its light spectrum is very close to the black-body spectrum of sunlight. It is said that this is due to the diatomic nature of the gas (S_2).
The reason we prefer incandescent lighting over any alternative is because of the perceived "warmth" of the light. This is because light from a heated source has a broad continuous spectrum which illuminates in a way we find pleasing. This applies equally to other heat sources of light - candlelight, lamplight, fire light and of course, sunlight. Fluorescent (and LED) light by contrast has a sharply peaked spectrum, and subjectively seems cold and clinical. Why is it (apparently) impossible to replicate the heat-generated light spectrum using these other technologies? Eg, a cluster of LED's of different colors should create a broad enough spectrum to resemble an incandescent source.
@shizlnit For broken bulbs: The filament gets white hot and if in air, quickly burns up as seen in the video. For intact bulbs: Over time the molecules of metal in the filament, when heated, spew off the filament towards the bulb envelope (thus darkening it). This thins the filament until it eventually breaks by the shock of the slight motion caused by the initial heating every time it is turned on. This can be prevented by running it cooler (lower voltage), but it is VERY wasteful.
Maybe i misinterpreted at 3:05, but how does argon gas insulate better than a vacuum? If the goal is to maximize radiative output, wouldn't you want to completely eliminate conduction and convection by having the filament in vacuum?
@CraigMerton The gas pressure and the glow temperature is carefully calibrated so that this halogen cycle of depositing metal on the filament is at its peak efficiency. If you feed the bulb with too high a voltage, the gas will not be able to receive all evaporated metal. If you feed it too low, the cycle will not be complete. That's why it is good to periodically run dimmed halogen lights at nominal voltage so that the halogen cycle can fully deposit metal back on the filament.
@engineerguyvideo It's just that I've always wondered how they made those noiseless bulbs with the bell inside to demonstrate that sound couldn't travel through void. I mean, sucking air out of a glass bulb would make the difference of pressures massive. I don't know how it doesn't collapse.
Here I am, 12 years after this was made and appreciating your work.
2:52 "I love that!"
This right here is why this guy is a National treasure. He has an encyclopedia's worth of knowledge and wisdom, yet his love for engineering still gives him a child-like fascination with the nature of nature. It's infectious and makes me want to be as excited as he is. I hope to always have this sort of intrigue and wonderment about science for as long as i live.
He's reading from a script, text written by a team of people.
@@xXxserenityxXx Yeah whatever, fuck off
@Serenity Klein fair point
The better you know your topic the clearer and simpler you can teach it. These videos are awesome and this gentleman obviously knows his stuff. You have another subscriber.
This guy has a really nice theme for his videos. Feels smooth and calming, yet lets you know that you're progressing through something significant. Really nice, when you think about it,
I don't know if I'm more impressed with how the light bulb works, or with the way he took off the glass shell.
I love your ability to condense that amount of info in 3 minutes, and make it interesting and yet, not overwhelming. Wonderful, Than you!
*Wears safety glasses to slowly cut glass bulb, takes them off to snap tungsten bar*
The tungsten doesn't microfracture like glass does
At the very least, just by wearing the glasses he’s got us discussing safety.
This is what safety culture is all about. Doesn’t have to be perfect, because nothing is, but is on the forefront of our minds.
I loved that he also put the glasses on to burn the filament.
Staying safe doesn't always have to take a lot of effort, but can save you a lot of pain (or worse) once in a while.
Lord thundering Jesus, does this guy make the best videos in the world or what? His presenter skills are excellent, his voice, tone, pacing, inflections, subject matter, and demonstrations are uniformly awesome. World class. He makes me revel in the engineering of things I'm not even interested in. Give this man a raise!
for the most part he is correct, however, not every filament is the same. I work in a plant that manufactures incandescent bulbs, and depending on the wattage the coil will vary in size and length significantly. from nightlight/christmas light bulbs to huge stadium lights, each coil is different. also, argon is not the only gas used. sometimes argon, nitrogen and xenon are used either in a mix or independently depending upon the light output desired. also, red phosphorus is used to coat the coil before it even enters the glass bulb, that way, when the bulb is ignited for the first time, the phosporous will destroy any contamination and oxygen that may have gotten inside.
+Brandon Waterman Okay this might be a lame question, but here goes- Why Tungsten? What's so special about this really difficult-to-use metal that makes it the suitable candidate for incandescent filaments?
Of all elements we have, tungsten is the only one capable of handling the high temperatures produced for prolonged periods of time while emitting enough lumens to be able to see.
Brandon Waterman Thanks mate.
+Get a fucking life, will you?!!! any time
+Brandon Waterman his youtube name made me read your comments like it was an insult xD
YOU ARE TEACHER OF THE CENTURY !!!!
indeed
I strongly agree that Bill is one really good teacher. I watch all his stuff and am never bored.
Bill is a rare combination of passion for engineering, engineering and a sense of a nice curious human nature + psychology, thus teaching skills
me too!!
Great comment. I don't know how it took me eight years to find this great series. But, better late than never. 🤗🌻
You're the best! Clean, straight forward, you speak with clarity and at a pace that allows one to really take in the info. Thank u.
0:55 "if we zoom in a little bit."
*zooms 100 times*
Maybe 10x
Enhance!
@@JohnDobak Just print the damn thing!
Looks like worms LOL
Love how well produced these short videos are. Great work guys!
The thing I like is that everything you do is so concise. It's terrific.
Wow !! I don't know how this wonderful man came into my feed ?? But he is not just interesting to watch but very easy to understand
Wonderful speaker. Probably never watch your videos if it wasn't for your awesome announcer-like voice and the ways you keep us interested. Thanks!
Guys like you are the real youtube stars , and videos like these give a true value to the very concept of youtube
Thank you sir
1:02 "But if we look even closer, you can see it's a coil within a coil"
*INCEPTION MUSIC INTENSIFIES*
lol
BWWWAAAAUUUUUUMMMMM!!!!!!
This channel is outstanding. Interesting topics, slickly produced, and radio-quality-voice narration. Thanks!
Thank you Bill! Your videos are the kind of nerdy engineer-y content I crave but can find very little of around the web.
I'd never believed that that much work is required to make a tungsten filament! :O
My local teacher used original lightbulb filaments to coach his after school runners about the limits of the human heart.
I'm a lucky man.
I didn't know that producing the filament would be such a complicated process. There is one type of bulb that I find particularly interesting and it is the halogen bulb. I used to wonder what it is that makes it brighter and whiter than the regular bulb. What I found is that the halogen gas in the bulb makes it possible for the filament to endure a higher temperature without evaporating.
Perfect engineer guy I have never seen from centuries
Bill, you give a wonderful and valuable service to the world. Please keep it up!
You are very nice, eloquent, knowledgable and practical. I wish I had a physics or engineering teacher like you.
Another great video. Thanks. How many of you have gotten a burned-out bulb to come back to life by gently tapping it so that the broken filament fuses back together?
Awesome video. Short, straight to the point, and packed with information. Thank you.
This is the first time I have seen Bill and this is absolutely wonderful. Thank you Bill :) What a wonderful teacher. (And I have had enough to know the difference lols).
You are truly amazing. I hope the frequency of new videos increase!
Your passion for engineering is so inspiring.
Nice. Bill, these are the most professional youtube videos I know of. Bar none.
And this vid goes to show how seemingly cheap everyday objects are actually quite difficult to make and only became affordable though much effort. Gives us hope that some very desirable technologies like solar PV and lithium batteries may well become more affordable and dominate the generation of electricity for powering your (LED) lightbulbs.
This is an incredibly well done video! Incandescent light bulbs are so popular, produce a pleasing spectrum of light compared to current LEDs and yet... are so wasteful. Is it that tungsten has a high resistance but the engineered wire is heated to a glow because the voltage forces the electrons to pass through?
Light seems to be a combination of heat and phase shift (reactive point).
Words cannot express how much I love these videos!
You sir are amazing. Love your videos and the vibe you put into them!
Dude i just found this channel and i cant stop watching videos 😂
“Coil within a coil”
Coilception.
What a wonderful insight and a wonderfully produced video, thank you.
Didn't Coolidge say that if he had known anything about working with tungsten to start with he would never have tried to use it as a filament?
I WATCHED YOUR ALL VIDEOS. THANKS SIR FOR SHARING AND DEMONSTRATING YOUR KNOWLEDGE IN SUCH A BEST MANNER WHICH HELPS IN BETTER UNDERSTANDING. MORE VIDEOS WILL BE APPRECIATED SIR.
I see this 10 years late and am still impressed
So much love and respect for you sir..
my grandpa was an engineer so I've always been interested in this stuff
This is exhilarating
As with many ideas, sometimes is not just about inventing something, but your ability to market it and sell it, that will ultimately earn you a footnote.
These are truly brilliant, please keep them coming.
excellent that you noted Joseph Swan, great vids.
Damn, Bill, you've been doing this a long time!
Woah dude! Your explanation was impressive. Thanks a lot for taking time to share this information.
yo dawg i heard you like coils....
So I coiled your coils! HOW COOL IS THAT?!?
This is the comment I was looking for..... 😀😁😂😃
...so we made you a coil; and turned your coil into a coil; so you can pass voltage (which was down-stepped though another coil) through the coil of coils; so you don’t have an accident in the dark and have to coil over.
Say coil one more time...
Eric Zediana “coil”... what do I win?
from 2:00 to 2:30 is the best thirty seconds of video I have ever witnessed. Praise to the guy or girl that made that.
We really miss you man. Could really use a few of your videos during this shitty world burning situation we got going on
I can honestly say, watching your videos makes me want to go back to college and study engineering .
i always feel so smart when i can understand this guys videos
@goblend
Those bulbs also are of a design that burns at a lower temp in a way the filament in them is more like what you'd find inside a vacuum tube.
In newer bulbs they pushed up the temps to get a whiter light and switch from a vacuum in the bulb to argon to cut costs.
Now there are long life bulbs they burn at a slightly lower temp which yields a more yellowish light and the filament has multiple supports to prevent it from breaking.
great work guy. you are succint and knowledgeable. love how genuine you are
@CraigMerton I also heard that if you touch the bulb so that grease or dirt is left on the glass. The light will heat it and the heat will make the glass crystallize. When the glass crystallizes it will no longer be able to seal the gas since the crystal form is not gas tight which the amorph glass is.
that is rough old school observational science. props for that work they did
Imagine being able to have a talk with Bill Coolidge about his process in developing the technique for ductile tungsten.
Found this guy from his soda can video years ago and now have returned thanks to Dr Stone. Science beats fantasy all the time
"how the fuck are they gonna do that?"
1episode later
"yeah, that is not how that works."
also senku brings rocks in a bag, like WTF! at least make a fucking wheel barrow!
I am also an engineer but these small stuffs still amazes me. Great Vids.
@alphabeets Yes, but you will notice that the lamp envelope gets bigger, too, so that the temperature of the glass stays about the same (more surface area). I made a boot drier out of an old Christmas tree lighting string with two lamps. The normal small 7-watt lamps melted the boot liner, but 7-watt lamps that were twice the diameter were cool enough not to damage the boots with the same amount of heat.
I love the way this man explains exotic engineering 😁
This is so damn awesome, I'm so glad I randomly stumbled upon this.
Maybe the most telling part of this video is how Bill stated the incandescent bulbs' days are numbered. LED bulbs are getting cheap; at the time of this post, they are outweigh their cost-to-life benefit. Yet it is so cool to see how something maybe you and I grew up on explained, and yet maybe one day we will show this to the future generation as an aside of how technology was when we grew up.
The BGM played during your excellent presentation is very fantastic...!!!
yaaay, new video! this one was great too. can't wait for the next one!
Great explanation, thank you!
Your videos are so enLIGHTening lol sorry couldn't help myself :) Seriously tho, love your vidoes.
You sir, are doing a great service to mankind.
I find it fascinating the numerous steps it takes to produce materials like that. How in the world did they figure out the exact sequence and the exact ingredient of each step?
Lots of educated guesses and trial and error, plus plenty of research money!
At a minimum...
1. Motivation for the project. (Imagination, vision)
2. Engineering prowess. (Technical mindset)
3. Scientific method. (Analytical and methodical discipline)
4. Grants, donations, capital (Commercial mindset)
and know i know about the coil within the coil i must rethink my life. nah. but srsly you just taught me something new and i'm glad for it. thanks man.
@CraigMerton
Also note that low voltage (12V) halogen bulbs have a considerably thicker filament than high voltage bulbs and they glow at a higher temperature which is why they have a whiter light than high voltage halogen bulbs that have come to the market recently.
Already spoiling next Dr. Stone, smh
Dead
Great minds
@CraigMerton The gas in a halogen bulb reacts with the evaporated metal as soon as it leaves the filament. When the metal-halogen gas touches the glowing filament, the heat from it breaks the molecule and deposits the metal back on the filament.
you should comment in the metric system. the inches and ounces kills it
This is America. We use ounces and inches. Learn it.
Ulisses Casemiro Fuck off
Don't learn it. Imperial measurement is outdated and clumsy. The majority of the world's scientists, and Bill's peers, work in metric.
Mutilated light bulb: _burns to death_
Bill: "I love that."
I like how he takes out a pipe cutter to slowly cut into the bulb to cleanly take the glass off, only for the glass to crack and pop out anyway.
A rather new invention is the sulphur lamp or daylight lamp which is an incandescent lamp. What's remarkable about this lamp is that its light spectrum is very close to the black-body spectrum of sunlight. It is said that this is due to the diatomic nature of the gas (S_2).
The reason we prefer incandescent lighting over any alternative is because of the perceived "warmth" of the light. This is because light from a heated source has a broad continuous spectrum which illuminates in a way we find pleasing. This applies equally to other heat sources of light - candlelight, lamplight, fire light and of course, sunlight. Fluorescent (and LED) light by contrast has a sharply peaked spectrum, and subjectively seems cold and clinical. Why is it (apparently) impossible to replicate the heat-generated light spectrum using these other technologies? Eg, a cluster of LED's of different colors should create a broad enough spectrum to resemble an incandescent source.
You light up our lives sir!
These videos are just too good
@shizlnit For broken bulbs: The filament gets white hot and if in air, quickly burns up as seen in the video. For intact bulbs: Over time the molecules of metal in the filament, when heated, spew off the filament towards the bulb envelope (thus darkening it). This thins the filament until it eventually breaks by the shock of the slight motion caused by the initial heating every time it is turned on. This can be prevented by running it cooler (lower voltage), but it is VERY wasteful.
Anybody else like listening to this guy while playing Oblivion I don't know why but it's one of my favorite things to do
Amazing tungsten educational video. Thanks!
I freakin love this guy. Wish I had him as a teacher/professor when I was in school. I would totally be an engineer of some sort.
moar vids :) this is really interesting!!!! I wish you could have a weekly episode!
I always wanted to know a lightbulb works! thanks man, your videos are awesome!
Maybe i misinterpreted at 3:05, but how does argon gas insulate better than a vacuum? If the goal is to maximize radiative output, wouldn't you want to completely eliminate conduction and convection by having the filament in vacuum?
@CraigMerton The gas pressure and the glow temperature is carefully calibrated so that this halogen cycle of depositing metal on the filament is at its peak efficiency. If you feed the bulb with too high a voltage, the gas will not be able to receive all evaporated metal. If you feed it too low, the cycle will not be complete. That's why it is good to periodically run dimmed halogen lights at nominal voltage so that the halogen cycle can fully deposit metal back on the filament.
I still use incandescent light bulbs a lot and have a stockpile for the foreseeable future.
You should make a video about LED's, and include Holonyak in it! Hopefully I might be able to meet you in person if I attend UIUC.
instead of using argon can we use any other inert gas????
+Vishal Chaurasiya well we can use the other inert gas but they argon
+Vishal Chaurasiya We could (Krypton and Xenon are used in some types), but Argon is the cheapest and most abundant.
yes
Bob Weiss I know this is an old comment, but why not nitrogen?
@BRAVOZULU DWEST boathouse OOOO they'd be sure to get a bang outta that HA HA
How did they create vacuum inside of the bulb?
You beat me to it
LED lights and halogen lights may be more popular nowadays, but I prefer the light emitted from these tungsten bulbs.
Dee Zee Isn't it really impractical though? It's a huge amount of energy that's all being converted to heat
Halogen lights use tungsten filaments.
@@wahconah98 It is the improved version of incandescent lights.
man...he's so good in opening things
i would have broken it
A marvelous video sir!!!
Million subscribers! Congrats!
Would like to see the manufacturing process of that bulb filament.
@engineerguyvideo It's just that I've always wondered how they made those noiseless bulbs with the bell inside to demonstrate that sound couldn't travel through void. I mean, sucking air out of a glass bulb would make the difference of pressures massive. I don't know how it doesn't collapse.