Accession No

1347

Brief Description

pivoted magnet, tangent galvanometer, Helmholtz-Gaugain type, by Elliott Brothers, English, 4th 1/4 19th Century

Origin

England; London

Maker

Elliott Brothers

Class

electrical

Earliest Date

1875

Latest Date

1900

Inscription Date

Material

wood; metal (brass, magnet, silver, copper); plastic (ebonite, ivorine); glass

Dimensions

length 337mm; breadth 270mm; height 400mm

Special Collection

Provenance

Donated by the Royal Institution. Previously owned by Warren de la Rue (see also Wh. 1325 and Wh.1360).

Inscription

on ivorine disk set into wooden frame: “ELLIOT BROS. / 449 / STRAND / LONDON”
on ivorine plate on frame (added): “WARREN DE LA RUE ESQ / F.R.S”

Description Notes

Instrument pivots on circular wooden base; three brass levelling feet; four brass terminals mounted on ebonite plate fixed to rotatable wooden base; two vertical coaxial coils in circular wooden frames, separated by their radius (approximately six inches); central wooden pillar supports horizonal brass case, with glass top, for pivoted magetic pointer and silvered dial; scale divided by degrees into quadrants; in addition to the fine-wire coils connected to the four terminals, there is a single circle of copper rod in each of the two circular frames, connected in a series, with two threaded brass terminals at its ends.
Condition fine and complete.

References

Events