Accession No

1325

Brief Description

quadrant electrometer, reflecting, owned by Warren De la Rue, attributed to Elliott Brothers, English, 1880-1890 (c)

Origin

England [based on attributed maker]

Maker

Elliott Brothers [attributed]

Class

electrical

Earliest Date

1880

Latest Date

1890

Inscription Date

Material

metal (brass, aluminium); glass; plastic (ebonite)

Dimensions

height 365mm; maximum diameter 220mm box height 413mm; breadth 275mm; depth 257mm

Special Collection

Provenance

Donated by the Royal Institution. Previously owned by Warren De la Rue (see also Wh.1347 and Wh.1360).

Inscription

Description Notes

Circular brass base; three levelling feet; each hollow box quadrant supported on glass post; brass rod supporting suspension with insulated feed through and terminal at top; suspended needle with light aluminium vane; glass cup with silvered outer surface rests on base; brass connecting rods with terminals lead to two quadrants; wires connecting opposite quadrants connected to terminals on underside of quadrants; screw adjustment for positioning one quadrant; rotating switch with ebonite handle extends from under the base; glass cover; brass shielding cage. No inscriptions.

Condition: fine (suspension broken); incomplete (mirror, one nut for quadrant support, and rod for electrical connection to quadrant missing).

References

Events