Accession No

3342

Brief Description

electrostatic voltmeter, by Kelvin and James White Ltd., English/Scottish, 1905 (c)

Origin

Scotland; Glasgow or England; London

Maker

Kelvin and James White Ltd.

Class

electrical

Earliest Date

1905

Latest Date

1905

Inscription Date

Material

metal; glass; plastic (ebonite); wood

Dimensions

box height 385mm; breadth 267mm; depth 323mm

Special Collection

Provenance

Transferred from Department of Engineering, University of Cambridge, Cambridge, England, 1986.

Inscription

‘KELVIN
MULTICELLULAR
VOLTMETER No. 2987
KELVIN & JAMES WHITE LTD.
GLASGOW & LONDON.
PATENT’(on case)

Description Notes

In metal case, all painted black; horizontal glazed window showing white dial with mirror; non-linear scale, 0 to 120 volts; two terminals, ‘O - ON’ switch, clamp screw, and bubble level on horizontal surface of case; cylindrical upper part of case houses suspension mechanism and includes zero adjustment screw; three feet, two adjustable; glass cup at bottom to contain oil for damping; with five-positioned resistance box, silvered metal with ebonite top; in wooden carrying case with hinged lid; bottle full of oil, labelled ‘(Castor) OIL FOR DASHPOTS’.
Similar to Wh: 3358.

Condition: fair (suspension broken); complete (no oil bottle or resistance box).

References

Events