Accession No

1359

Brief Description

suspended magnet, pointer and reflecting, astatic galvanometer, by W. Ladd and Company, English, 4th 1/4 19th Century

Origin

England; London; 11 and 12 Beak Street

Maker

W. Ladd and Company

Class

electrical

Earliest Date

1875

Latest Date

1900

Inscription Date

Material

wood; metal (brass, magnet); paper; glass (mirror)

Dimensions

height 445mm; diameter 282mm

Special Collection

Cavendish Collection?

Provenance

Transferred from the Cavendish Laboratory, University of Cambridge.

Inscription

on dial: “W. Ladd & Co. / 11 & 12 Beak Street. W.”
on brass plate (added): “E 149”

Description Notes

Circular wooden base; three brass levelling feet; two brass terminals; flat horizontal coil on wooden former underneath circular paper dial; hand lettered divided circle, 5-degree divisions; two brass standards support suspension fibre; two opposing wire magnets supported horizontally, lower magnet within coil, upper magnet above dial ; pointer extension on upper magnet; mirror mounted above pointer.
(suspension fibre replaced by nylon line); complete.

References

Events