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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 |
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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 |
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