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H1MIN: OPTICAL RANGEFINDERS
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- เผยแพร่เมื่อ 13 เม.ย. 2018
- Optical rangefinders were an essential tool in all forms of artillery.
This video explores the basic mechanics of how they work.
If you are interested in learning more, these links below provide fascinating insights. Courtesy to them for their valuable research and insights.
en.wikipedia.or...
www.navsource.o...
mathscinotes.co...
www.eugeneleesl...
I had always wondered how these types of optical range finders worked, now I know. Thank you.
Before i watching this video i though it look like how hammerhead shark see
I still dont know
Me too
And knowing is half the battle.
THIS.
When I was learning trig in high school, I thought to myself, "man, i can probably learn the distance of things with trig manipulation." But I couldn't wrap my head around it, and I didn't have a lot of time to muse over it since I'd miss things in class, and also I other things captured my attention.
But man, it's satisfying to see that indeed, they used trig to do rangefinding back then
its pretty easy math, tan x = o/a where x is the angle, o is the side opposite the angle, and a is the side adjacent to the angle. a would be the length of the rangefinder, o is the distance, so just rearrange to solve for o, tan x * a = o
well not only back then, when you want to know the distance between you and a sun, you can't throw radar waves at it. Not only will it not work due to background radiation but you'd wait forever. This knowledge is still used today, and it's got so many applications :D
This is why you need to pay attention in trigonometry class in school
bruh they probably had sliders with pre calculated values.
@@UltraNyan They turned a knob, read a number and passed that number on.
To travel back to 1918?
The range finders were manned by deckhands. Who were deckhands because they did not pay attention while at school.
Hence the instruments had calibrated scales with the range readings. The sailors did not make the calculations.
Having said that, paying attention to trigonometry IS a great idea.
@Sparky Puddins You'll be fine. A criteria when designing military weapons is that they must be useable for uneducated people.
And yes, I was in the Forces 😉
I was a OM in the U.S. NAVY and we repaired these rangefinders, gunsights, bino"s and other optical equipment. It was the best rate in the Navy!
I literally never knew the mk 37 had people in them
Another excellent and concise video. These naval rangefinders were only part of the "hitting a moving target 9 miles away" apparatus. The range calulated from these rangefinders was then fed into a fire control computer which took in all the variables...Range to target....Own ship's course & speed.... Target ships course and speed, being the most obvious, but there were also MANY other variables which had to be taken into account, especially at longer ranges. These computers developed into HUGELY complex mechanical and then electro mechanical machines, which would then spit out the correct bearing (azimuth) and elevation angles for the guns.
Once a couple of "sighting shots" had been fired, the fall of those shots would then be observed (Left/right of target....Short or over) and corrections fed into the computer , until straddles & hits were obseved on the target.
Thank you for your excellent comments and insights. The Ford fire control computer on the Iowa class Battleships are amazing pieces of technology considering they were mechanical.
If you make video THIS is how you do it.
1. It's short and to the point.
2. It does not have unnecessary, annoying music covering up the speaker's voice. He can be clearly heard.
3. It gets into the topic quickly.
4. It finishes without a plea to subscribe. (It respects its viewers.)
Oh, and thereby earns my subscription.
Well done.
I prefer to think of the geometry of range-finding for your gun as... "triggernometry."
Wow! Even a geek like myself will have to say "Never thought of that".
Surprisingly simple.
Great video !!
I found out that binoculars can do the same thing by moving the focus. It actually moves the depth of field
I love this short videos, if you could make one about HEATFS like you did with the APFSDS it will be awesome
(#Subbed)
Good suggestion, I have started one on HESH, but for HEAT I was thinking about tandem warheads since most modern amor systems use them. Just need more research.
Great!
Really good videos explaining interesting topics in military. Keep it up, you deserve a lot more views with videos like that!
THE INVENTOR MAYBE HAVE A LOT TOUGH TIME CREATING IT. :3
This was a simple, short, informative, but well spoken video. You my friend have earned a new sub P.S really like your not overly enthusiastic/annoying voice, it's a refreshing break from all these other youtubers
This is the punk rock military history channel. The info is delivered very quickly and effectively.
I knew it. Just like a 35mm film rangefinder camera focusing. Thanks for sharing.
On Spot explanations. So much better than other "history" channels that use 2 mins to advertise pay to win egoshooters and then proceed to name every solider involved in the event because they read that one book. Thank you.
Very good! I would love to see a video on the Sidewinder and the old spin-scan seekers.
This was a great suggestion, after some research I made a video. Sorry it took so long. Thank you! th-cam.com/video/axPJcdvJxLs/w-d-xo.html
These videos are great short and straight to the point not like other videos that go on and on around a topic and only actually cover it at the end.
Holy cow - didn't think the concept was that simple! Great video !
What talented lad this. Such underrated channel!
Nice job on the 3d Fletcher class destroyer. I served on 2.
THIS EXPLAINS WHY THEY PAINTED THE SHIPS WITH THOSE ZIG-ZAGTRIAGLE SHAPES!
omg thanks for the video
Yes! it was to disrupt rangefinders, not to hide them. They also made it hard to determine the length, or the distance between funnels, masts, and other superstructure, making identification hard, because if you know the ship type, your intelligence services may have described characteristics which help you identify max speed, draft, etc. Fake bow waves were another way to confuse guesses at speed. Some even made it hard to tell the target's relative course.
Another nice optical rangefinding method is called Stadiametric rangefinding, or just stadia (no, not Google). Lots of Soviet made sniper scopes and weapon systems had this, most notably in the PSO-1 scope. The way it works is by having a set height of your target known, say 1.7 meters for a person or 2.7 for armored targets, and through some clever trigonometry and math, a curve is drawn out according to the distance, often in increments of 100. If I missed anything please let me know
Here are some video ideas:
shells:
HESH
APHE
HEAT
APCR
Other:
Fritz X
Bunker buster
Cluster bomb
MOAB
Fuel air bomb
EXACTO bullet
Love your animations could watch it all day cheers
Also if you need any information about these shells i can give it to you
APHE is pretty lame. APCBCHE is a bit more interesting.
sounds simple when you hear it in 1 minute but it's brilliant love your channel bloke can't stop watching 👍
was playing From The Depths but didn't know how they work irl, really interesting
The fact that the Yamato-class had 15 meter size rangefinders is such a flex on that Pagoda Mast bridge.
Thanks for all this work and research, and editing, and everything
this is absolutely wild. I love the power of math
That is absolutely incredible how they figured that stuff out.
Trigonometry?
Presumably trigonometry was used in conjunction with those searchlights pointed at WW2 bombers to find the height to set the appropriate fuse time.
This channel is so interesting! Im spreading this videos like crazy to my mates 😘🥰😍
I wonder if they ever used this at night, and after thinking they had it lined up, fired, but instead hit a different ship than intended
During the 1930s the Japanese developed more powerful optics for use in night battles, so yes, rangefinders can be used at night. The only issue is finding targets to aim at using star shells, moon light, and other means of illumination
we have these maths in my college, I am a Sailor now😊
love from Philoppines!💕🇵🇭
Those are both coincident range finder. Stereoscopic doesn't need alignment but rather the operators read the differences in focus of the overlay inside
This is something worth knowing. Simple and accurate, one could easily build one for their own use for say surveying instead of using a long tape measure.
I would like to build one. How would you go about doing it?
We has similar range finders as mortarmen.
A bit shorter, light enough to carry around.
Needed calibration every time we used them, either with a known distance object or by looking for a very distant object like the sun.
I'm genuinely interested to know how you would calibrate the range finder by referencing the sun. Did you use some sort of filter to do this?
@@DreamKalibur there was a specific filter in the rangefinder.
You turned a switch that would slide the filter in the eyepiece.
@@Braun30 interesting.
What was the range on these types of rangefinders?
@@DreamKalibur theoretically there was no range limit as the distance was the result of the convergence of two images which were to be superimposed.
Effectively I presume up to 10 Km.
good ol' mechanical computers, thanks a lot for the great animation!
Very nice
So excited
Thanks Admin.
Great video !!! 👍👍👍
Please make a video on gun stabilizers.
I think the earliest ones just dampened the swinging of the barrel, once the tank stopped moving.
The next generation compensated for up and down movements. For shooting while driving, two more planes would need to be taken into account (essentially yaw, pitch, roll).
I can´t imagine building one of them, let alone without chips, transistors and the like... (the same goes for VT-fuses)
Keep it up man you deserve way more attention
You can buy hand-held versions for golfers. We had one in my old engineering office when we wanted to know how about far away something without using proper surveying equipment.
These videos are great. Thank you.
Interesting clips. Soporific narration.
I have one of these types of range finders hand held you look through the sight you see two images adjust a knob when they come together look down at the gauge and you have the distance.
didn't know rangefinders could be somewhat interesting. good video!
Thank you, I appreciate your support!
Could you make a video on Claymore and S-mine?
Thaaanks, great animation...
Even practical uses of math is less complicated than one's taught at school
The axis never developed radar range finding allowing for first shot hits in all weather. The USN system from mid 43 on was accurate in no visibility situations, using the mk 2 Ford analog computer
Trig is *everywhere* in science and engineering.
bru please cud ye show in details how each if the optical range finder types worked in details and what are the equations?
This concept is still used in astronomy and called "The Parallax Angle".
Thank you.
I wondered about the strange things on many German WWII-tanks and those double periscope (looking like bunny ears) on artillery. I guess they are smaller versions of it.
So did the dile give you the range, or did you have to do trig to read the data?
Remind me of those older film cameras
I would had become a mathematics expert if math tests would been like "calculate the distance to the enemy battleship" in school
same on Amx-50 Foch, Amx-30 (1972)
So a spotter scope works like a miniature one of that on the ship
Well we know one thing...that one day, trigonometry and algebra would save our lives.
i was waiting for the ship in the background to explode but then the video ended
*reality is often disappointing*
great video
What about that huge analog computer on the Missouri or Alabama battleships
Brilliant.
It looks like skestan principle ?
We think we are so high tech now.
We were pretty high tech even then.
your videos are beautiful are informative :)
Cool I like the video thank you
You should make one on fire control systems!
Me: Miss when will I need this irl?
Teacher: Yes
That's amazing
Excellent.
I didn't know these existed, but thought one could use the principal on a large flat piece of land.
Use rangefinding measurements and locations on dry flat land?
That's crazy talk. Only civil engineers and surveyors do such things daily for their jobs.
Why did the math teacher not use these as examples?If they did I bet a lot of us would learn much more.
Thank u
i am bingining these videos
So their was actually a purpose to knowing that one formula.
Wow all these studies in Trigonometry Hypotunese in Highschool and they had a Computer in 1933 that find it automatically?
Most improvement is the shortest time
When your parent order you changing radio knob and end up become rangefinder knob operator.
Me: Teacher, what will I do in real life with this trigonometry knowledge?
At that time Teacher: *Sends me to the navy*
So, the Optical RangeFinders are not magical artifacts that lost its powers before the electronic ones are created?
what software do you use??
I always thought I was the range finder as the forward observer? This particular type of range finder is for line of sight, obviously, but once those guns are directed on land, the FO has the ball, with eyes on target. Now, they probably have a drone do it.
Longer video please.
Interesting
Is this device is telemeter
An optical system cannot be jammed (OK, smoke screens) plus an optical system still has value in a situation where ships are potentially providing naval gunfire support. Drones are valuable but they aren't the only solution. Besides there is the potential for jamming drone communication channels or being shot fown.
One minute of condensed no bullshittery knowledge. This really needs respect. Especially on youtube.
Fun fact: you can find the same optical range finder on some WWII french Tank Destroyer
why didn't they use a ruler?
Acquired
nice fletcher rendering
Earlier in WW2 the Germans had far better optical rangefinders hence the successful hit on the Hood, later in WW2 the allies had RADAR range finding which was far superior.
I believe to become the crew, they need someone who passed the complicate math exam, and I wont pass it... lol
wow
So dazzle camo would have really messed with getting a reading with a coincidence rangefinder. Huh.
X marks the spot 🎯