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Electricity Supply
3
Object type
ohmmeter
1
potentiometer
1
voltmeter
1
Material
black, rigid plastic
3
copper alloy
3
glass
3
mahogany
2
white metal
2
blue coated metal
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ceramic
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felt
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lacquered copper alloy
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leather handle
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Evershed's portable ohmmeter no.20818
Early voltmeter
Crompton potentiometer in original case with maker's instructions
Crompton potentiometer