Accession No

2438

Brief Description

Portable, slide-wire DC Potentiometer, with built-in pivoted coil (‘Unipivot’) galvanometer, by Cambridge and Paul Instrument Company Ltd., 1922

Origin

England; London

Maker

Cambridge and Paul Instrument Company Ltd.

Class

electrical

Earliest Date

1922

Latest Date

1922

Inscription Date

Material

wood; hide (leather); plastic (ebonite); metal (brass); glass; paper

Dimensions

length 255mm; breadth 210mm; height 123mm

Special Collection

Provenance

Transferred from Department of Physical Chemistry, University of Cambridge, Cambridge, England, 1978.

Inscription

“UNIPIVOT GALVANOMETER (with logo) / CAMBRIDGE AND PAUL / INSTRUMENT CO. LTD. LONDON. / PATT. I. L5525” (on galvanometer dial);
“P92” (on top and lid, added)

Description Notes

Portable, slide-wire DC Potentiometer, with built-in pivoted coil (‘Unipivot’) galvanometer; Camb. & Paul Inst. Co., c.1921;
Rectangular wooden box with hinged lid anbd leather carrying strap; ebonite top; two pairs of brass terminals for battery and unknow n potential, respectively; two tapping keys; rotary current rheostat; rotary six-position switch and rotary slide-wire calibrated in millivolts; glazed window showing galvanometer dial with mirror; zero adjustment and clamping screws. Two papers fastened inside lid: hand drawn graph of e.m.f.calibration; hand lettered ‘DIRECTIONS FOR USE’.

condition: fair (insulated pair of leads added to circuit); complete

References

Events