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AKA homodyne radar

How horrible

I had a few of these proximity fuses from some shells my grandpa took from

The proximity fuse was a British invention.....handed over to the Americans in 1940.... Together with the cavity magnetron (which allowed portable airborne radar) Also the blueprints to sir frank whittles patented (1936) Jet engine.... Also included britains 15 year research into an atomic bomb. Delivered by Henry tizzard of the June 1940 tizzard mission to the usa.....and received by James phinney baxter the third Of the American office of strategic studies. Also included were blueprints for Other inventions and discoveries Rockets,gun sights,aiming apparatus,chemical warfare agents,etc etc... A trunk full of military secrets That advanced American technology 50 years in the space of a few months, And what the American baxter called.....the greatest treasure in the history of mankind that one nation bestowed on another. In return......with Britain currently perfecting the 4 engined long range Lancaster bomber.... Britain wanted Americas norden bombsight......... This request was.....refused.

I wonder if there were really lots of people that sounded like that or if this guy just made a good living narrating these films all over the US.

I finally understood how different bombing became after ww1

In the ordinance usage, it is usually spelled 'fuze'.

_”3 score...”_ ? People still said ‘score’ in the 1940s?

Very recommendable

I remember well, a proximity fuse triggering a shell as it left the barrel on our destroyer, massive explosion 10 metres from the gun. I thought they were on our side?

What is the average velocity of the schrapnel!?

Is the new fuse time delayed not to be set off by the barrel of the gun ....if that makes any sense ? Also when dropping a bunch of bombs at once ,how come the signal is not reflected off the neighboring bomb prematurely???

Some of the drawings here are a bit misleading. In the frame of reference of the moving munition the fragments spray out to the side. Correct. However the munitions are moving faster than the target (if it's an airplane) and of course the target could be utterly motionless. In the frame of reference of the target the fragments occupy a cone-shaped region with the tip of the cone being the point of explosion and the cone extending forward of that point. This is particularly true of artillery rounds; not so much for the slower bombs.

What great post. thanks

Completely ignores the fact that the Brits were working on these fuses first and came up with the idea - only when they order miniature valves off the Yanks did the Yanks suspect they were working on something like this and started making their own.

My father Martin Kesler Sr. was a dye (color) chemist and also worked on the polaroid sun glass plastic color in the nose cone of the VT fuse, which had trouble in the sun light. He further worked on the first polaroid land camera and the sun glasses use of the same color.

Why is that US clips, such as these, create an image of an American invention, when in reality it had been proposed and in development in the UK long before?

Die Geschichte ist süß! Der Transistor wurde erfunden 1947, er wurde nicht ab 1942 eingesetzt. Für das elektrische Feld brauchte man Röhren mit Heizspannung 6 V und Anodenspannung, 200 V. Dazu eine Batterie mit 150 Zellen und eine andere Batterie mit 4 Zellen. Auch die Senderöhre ist groß. Im Gehäuse ist kein Platz. Beim Abschuss wird aufgeheizt. Die Röhre ist arbeitsfähig nach mindestens 2 Minuten. Mittlerweile ist das Flugeug weggeflogen. Ich vermisse die Sendeantenne, nötig für das elektrische Feld. Natürlich wirken Kräfte von 20000 G und 5000 G (radial) auf Röhren und Batterien. ... und die Erde ist eine Scheibe.

this was such an amazing revolutionary fuse, yet in Vietnam when the mud season hit ,soldiers would complain shell damage would be absorbed from the soft ground impact. and my grandfather was in artillery in the late 40's 50's and said he never used the prox fuses just the timed ones. why did we stop using these fuses after ww2 they worked so well

Wow, that sure put a damper on his day, huh. 6:34

I honestly had no idea. That was one hell of a thing to invent and make en masse during that era.

Is this what's also referred to as flak?

It's a shame our world has to devote talented resources to build and use these things against each other. If not for this stuff and religion, we'd be to the stars by now.

Love " jam handy " films .

Invented in Great Britain and given free gratis tot he U.S.A. Great Britain finished paying for World War Two in 2006.

Being an old Marine Artillery Operations Chief ( 0848) I can say that shooting a VT fuse at a target works great...

Thanks for sharing this. I collect and restore old tools and Millers Falls brand tools are my favorite. I wish I could say why, but there is some sort of mysterious kindred spirit I have with the brand.

Thank you for uploading this video. It reminds me of when I was a young machinist through the 90’s learning from men of this era.

If you come across any WWII Rosie the Riveters in action on the machine tooling, that would be much appreciated. My Step Mom was a Rosie working on the Consolidated B-24 Liberator at the Consolidated Plant at Carswell Army Airfield.

Out of all the documentary and educational films of that entire era, Jam Handy productions are my absolute favorites!

@05:20 I wonder if that ruler maker still has "Made in U.S.A." on their rulers.

To consider the value of the proximity fuse for antiaircraft fire look at the sinking of the Bismark. The death knell was set when swordfish torpedo bombers damage the Bismark's rudder. The antiaircraft fire was ineffective because the timed fuses were preset with the firing order locked into how the reload ammunition was readied. The first were timed to explode at a certain distance which would be the initial firing. From there the shells would exploded progressively closer to the ship as the aircraft came closer. But the Swordfish was an old biplane model and slower than the German gunners expected to face. As a result many shells exploded harmlessly far in front of the Swordfish and the Bismark suffered loss of it's steering ability sealing it's fate. To get the miniature vacuum tubes for the fuses they looked to existing technology. Vacuum tubes for hearing aids. Hearing aids of that time were a box worn on the belt with a wire to an ear piece. This was the model for the tubes for the fuses. I believe such a fuse was also used on the first atomic bombs.

I want one. Now where to get and how much?

Cheap taps will come back and bite you .

Love the old Gerstner toolbox. Wonder what it looks like more than 75 years later.

Clearly this chanel is a dream for machinist.

Military science tricks

A three jaw would work for this.

They don't make cutting oil like that anymore.

10:45 says something if you can grind a drill, without even looking at what you're doing!

I love these old videos and your naration is excellent. Facinatinating stuff!

Question for those that know more about this, would the fuse be defeated, prematurely detonated, by the enemy if they could broadcast a strong radio frequency that the fuse was expecting to 'hear'?

Just looked them up on the map...lease sign out front..seems they lease out space now in that building, CNC machining killed that industry. Oh well Up and onward, but sad as well...thanks for the great video. Still square footage is relatively cheep.

You are so generous giving your time for this really worthwhile project - I intend to come over to see this magnificent facility can I thank you on behalf of everyone for your generosity in keeping this history safe.

Thanks for posting this! My grandfather passed away two years ago and I inherited a lot of his tools. In them were some Millers Falls steel number/letter punch sets from the 1940s. Noticed the label today and a Google search lead me here; awesome to see where they were likely made in video form.

Useful lesson from past! It's near...

I understand all the theoretical work was completed in the UK and communicated to the US for industrial development by the Tizard Committee in 1940. Hardly just a few ideas. Rather typical, I fear.

I think after watching this video i may have a diploma in Tap & Die

Nowadays they’re too busy teaching about transgender bathrooms and other ideological left wing indoctrination BS. No wonder the rest of the world is beating us in most industries while we die off from rampant opioid addiction.

Sounds like a pretty cool place.