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VOLT AND AMP METERS, 1930's
School Laboratory measuring meters, used in demonstration theatres, and before students were trained to use multi meters, when they started to come into use.
Volt meter is 0 to 10 volts
Amp meter is .5 To 3 amps.
Bruce Hammond Collection
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- I do not think these instruments would have been used for test areas. They remind me far more of the demonstration meters that were used in my school's physics lab for demonstrating the flow of current or presence of voltage in electrical circuits
.......... John Webb, London Colney, ST ALBANS, 18th of March 2010