Moving coil galvanometer

Vibration galvanometer

Ballistic reflecting galvanometer, London, England, 1920-1955

Drysdale-Tinsley universal potentiometer

Multiplier for Drysdale-Tinsley polyphase wattmeter

Potentiometer, for spontaneous polarisation measurements

Wheatstone bridge

Drysdale-Tinsley polyphase wattmeter

Standard ratio for use in bridge measurement

Weston normal cell (photo-electric)

Heythrop Mk V Phonic Chronoscope

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