Accession No

3422

Brief Description

strip-recording galvanometer, or thread recorder, by Cambridge Scientific Instrument Company Ltd., English, 1910

Origin

England; Cambridge

Maker

Cambridge Scientific Instrument Company Ltd.

Class

electrical

Earliest Date

1910

Latest Date

1910

Inscription Date

Material

wood; metal (brass, oxidised brass, white metal, cast iron); glass; plastic (ivorine, ebonite and at least one other); thread

Dimensions

length 342mm; breadth 286mm; height 353mm

Special Collection

Provenance

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

Inscription

‘The Cambridge Scientific Instrument CO LTD Cambridge ENGLAND NO 9558’ (front of frame)
‘the
Cambridge Scientific
Instrument Co. Ltd.
Cambridge, England.
NO 9558’ (ivorine plaque screwed onto door)

Description Notes

Rectangular wooden box with hinged, locking, glazed door, and glazed window in top. Three screw threads for feet (missing). Cast iron instrument frame, removable from box. Suspended coil D’Arsonval galvanometer at rear with long pointer extending to drum recorder at front. Clamp and zero adjustment at top, accessible through hole in top of case which can be covered by brass plate. Upper of two clockworks depresses pointer on inked thread every minute (or half minute). The continuous inked thread is also moved along a series of pulleys periodically. Lower clockwork rotates chart drum once every 25 hours. Linear scale above pointer, divided into 25 parts. Two terminals on base of frame for input potential; resistance coil missing. Plumb bob for levelling instrument on LHS. Keys for clockwork missing.

Condition good; incomplete (clockwork keys missing).

References

Events