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