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1945 - pocket size circuit tester has a tiny neon lamp on its top that glows when 2 circuit points are put in an electric circuit

POCKET SIZE CIRCUIT TESTER

CD 2478082 E&MP15.001

Electric Circuits, Breakers

AUG 19 1945

Circuit tester (pocket size) has a tiny neon lamp on its top that glows when 2 circuit points are put in an electric circuit. The intensity of the glow indicates the circuit condition; no glow shows a dead line. 


[a closer look]


Original Caption by Science Service



National Museum of American History

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