Accession No

2437

Brief Description

Wheatstone Bridge, plug type, Post Office pattern, by Cambridge and Paul Instrument Company Ltd., English, 1921

Origin

England; London

Maker

Cambridge and Paul Instrument Company Ltd.

Class

electrical

Earliest Date

1921

Latest Date

1921

Inscription Date

Material

wood; plastic (ebonite); metal (brass); hide (leather); ceramic

Dimensions

length 260mm; breadth 260mm; height 117mm

Special Collection

Provenance

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

Inscription

“THE CAMBRIDGE AND PAUL / INSTRUMENT CO. LTD. ENGLAND / No. L-4415” (on top)
“B5 / 5” (on lid, added)

Description Notes

Plug type Wheatstone Bridge, Post Office pattern, made by Camb. & Paul Inst. Co., c.1920; Rectangular wooden box with hinged lid and leather carrying strap; ebonite top; seven plated brass terminals; two lockable tapping keys with ebonite handles; twenty-four flush mounted plug receptors; twenty-four brass and ebonite plugs; four pairs of proportional coils of 1, 10, 100 and 1 000 ohms; sixteen coils from 1 ohm to 5 000 ohms, total 11 110 ohms; all twenty-four coils wound on ceramic bobbins, fastened to underside of top plate.

References

Events