Pocket voltmeter
Object No. B2110
Analogue voltmeter, dirrect current, measures 0 to 6 volts, metal / glass / rubber, maker unknown, place of production unknown, 1920-1940
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Summary
Physical Description
Voltmeter, pocket, 0-6 VDC ... has the appearance of a pocket watch with a lead, probe fixed solidly to case ... used by experimenters in the twenties and thirties ... (SB).
DIMENSIONS
Width
45 mm
PRODUCTION
Notes
'A watch is essentially a portable, spring driven timekeeper containing a series of geared wheels to transfer energy from a wound spring to an escapement which controls the speed of the unwinding spring. It is the escapement which can be heard 'ticking' as it allows the spring to unwind, releasing one tooth of the last wheel in the gear train at each tick.' George Daniels 1980 References George Daniels, Ohannes Markarian, Watches and Clocks in the Sir David Salomons Collection, Sotheby Publications, London, 1980
SOURCE
Credit Line
Gift of Sydney Church Of England Grammar School, 1973
Acquisition Date
4 December 1973
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