Cathode Ray Tubes
Two cathode ray tubes, in which there are three platinum wires fused into small glass heads. These three wires supply positive electricity while a fourth, negative, wire carries a cathode in the form of a concave mirror (a)
Picture No
13346607
Media ID
47785575
Size
2575px x 2550px
(2.0MB)
Credit
© New York Public Library / Science Source / Mary Evans Picture Library
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Source
New York Public Library
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