Salvaged tooling from Ford Aerospace, any use @ home?

[born to die]

I went to a garage sale recently, lots of industrial tools that belonged a retired Lockheed employee (according to the wife, who was running the sale). I bought a parts tumbler, and she tossed in a few random objects to get rid of them, including this magnet. She had no idea what it was for.

Does anyone recognize this type of magnet? It looks like it might hold pipe inside the horseshoe, given the shell wraps into that recess. The stickers say "PREHEAT 79A" and "OSCILLATE 76A".

 

[RTM]

There are some liquid penetrant tests where magnets and preheat and oscillate all come in to play.

I previously had a big honking magnet that came out of an electrical instrument plant back in the late 60s early 70s. Someone suggested it may have been part of a magnetron, but the ends of mine were opposing, creating a field in a gap 1-1/4” wide, with faces about that diameter

 

[kaymccampbell]

There are some liquid penetrant tests where magnets and preheat and oscillate all come in to play.

Welding, too.

 

[TurnipTruck]

I have that exact magnet.
I was told the notches for a pipe are for a “keeper”, which must prevent/slow down magnetic flux loss?, and that the magnets initial use was agricultural, like in a combine or thresher, to collect metallic junk. Not much of that around up here.

 

[born to die]

Thanks for the info... maybe someday I'll think of a use for it.

Well it turns out the source wasn't Lockheed, but Ford Aerospace. I found a 1985 invoice inside another box. This one was full of wafering blades in various states of use, most are branded "Norton Diamond Wheel". It looks like they were ordered for something called a "Deco Cut-off Machine". These appear to be stupid expensive today, up to $500 each... they were $125 each in 1985!

Anybody ever used these successfully in something like an angle grinder? Any use for the home shop? I go through lots of cheap cutoff wheels here.