Accession No

3659

Brief Description

slide-wire DC potentiometer, Crompton type, by Crompton and Company Ltd., English, 1900 (c)

Origin

England; London; Holborn; Stanley Great Turnstile

Maker

Crompton and Company Ltd.

Class

electrical

Earliest Date

1890

Latest Date

1910

Inscription Date

Material

wood; plastic (ebonite, ivorine); metal (brass)

Dimensions

overall length 1556mm; breadth 272mm; height 157mm

Special Collection

Provenance

Inscription

“MESSRS. CROMPTON & CO. LTD. / LONDON & CHELMSFORD / CROMPTON POTENTIOMETER” (on central ebonite plate);
“STANLEY GREAT TURNSTILE HOLBORN LONDON” (on ivorine scale);
“P.86” (on front of lid, added)

Description Notes

Slide-wire DC potentiometer, Crompton type; Crompton & Co., dec.1900;
Seven circular or octagonal ebonite plates mounted on top of wooden box; on plates are mounted rotary switches, tapping keys, and a rheostat, with ebonite handles; slide-wire with ivorine scale, 271 mm long, with divisions from ‘0’ to ‘100’; another 350 mm scale (for calibrating, usint standard cell, at different temperatures) marked from ‘5’ to ‘30’, and labelled ‘VALUE OF CLARK STANDARD CELL AT...DEGREES CENTIGRADE’; ebonite and brass cursor with locking screw and tapping key; eighteen threaded brass terminals (for standard cells, galvanometer, battery, and five potentials to be measured) mounted on ebonite plates on back of box. With wooden lid.

Condition: Fine; complete

References

Events