Lord Kelvin's cell tester, no.24, by James White,

Made:
1890-1900
maker:
James White

Lord Kelvin's cell tester, no.24, by James White, Glasgow (A moving-coil centre-zero voltmeter reading to plus and minus 4.5V)

Details

Category:
Electricity and Magnetism
Object Number:
1980-1211
credit:
White Electrical Instruments Co.