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Description
"Dr. Lee de Forest, who will be 79 this month, shows his latest invention to Dr. Robert Millikan of CalTech. His problem was to turn heat directly into electricity. This is done by pumping the air out of the metal pot, then a 5 inch disk is heated to incandescance to throw off electrons. The idea resembles the common vacuum tube invented by Dr. de Forest but would require no outside voltage to accelerate electrons."
Type
image
Format
Black & White
Identifier
94F17BEC-492C-4717-AA1E-923610472082 2003-59-219
Subject
Inventions Heat of combustion (LCSH) Millikan, Robert Andrews De Forest, Lee
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