Kleigl flash pots? Could someone tell me if I am right?

[kittyn3]

I was cleaning out a storage area at the theater that I work at and found several metal boxes with a cable coming out of them. They are completely enclosed and the top has a plate of copper that sets down inside the box about a 1/2 in. It looks like it could hold a substance. The box measures 7in.x 4in. x 5in. I opened one up and it has a socket for a light buld in it. My guess was that it was a type of flash pot, but I could be wrong. Could any tell me what these are?

 

[philhaney]

Could you tell us if there are any placards or other markings (and what they say)? Or maybe post a picture or two (if possible)?

 

[kittyn3]

The only placard that is on it says Kliegl Bros. Shop 22 L.I.C. N.Y. Made in the USA. I have pictures that I have to download when I get home. I will post those latter.