potentiometer no.1012 - 1920
Crompton potentiometer
Evershed portable testing set
G.P.O. moving coil milliameter and voltmeter
Avodaptor for use with Avo meter to test radio equipment
Siemens and Halske test set no.46371
portable voltmeter no.94282 - 1918, 0-600v.
Electrostatic voltmeter, disassembled to show parts
