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ID number:  BIRRC-P0073
Institution:  Research and Cultural Collections
Named collection:  Historic Physics Collection
Artist / Maker:  White, J.
Title / Object name:  Kelvin Multicellular Voltmeter
Object type:  Electrical instrument
Place made:  Glasgow
Materials:  Brass and other materials on wooden stand
Measurements:  32 x 17 x 19 cm on base 40 x 23 x 33 cm

This instrument is for measuring large static voltages, in this case up to 1800 V. The principle is that of a quadrant electrometer. A stack of metal vanes is mounted on a torsion suspension and can swing between set of fixed plates. When a voltage is applied between the vanes and the plates the vanes move twisting the suspension, and the resulting deflection is read off from a pointer fixed to them. By the nature of the device, the scale is very non-linear.

Inscriptions / Translations:  Lord Kelvin’s Patents
Multicellular voltmeter no 308
J. White, Glasgow

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