What is this factor?


It appears like it must have fire in it. It has small air inlet and no exhaust. It was produced by Dietzgen. They make surveying and drafting gear.

There&#039s a huge steel valve with a lever that controls a flapper in the bottom. A bulge in the tin cover lines up with the word CLOSE on the casting to leave the flapper closed.

It was in a thrift shop listed as a hand warmer. I doubt it.

Anyone have a clue?





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