Accession No

4192

Brief Description

resistance box, by Robert W. Paul, English, 1910-1920 (c)

Origin

England; London

Maker

Paul, Robert W.

Class

electrical

Earliest Date

1910

Latest Date

1920

Inscription Date

Material

wood; metal (copper, other, brass); plastic (ebonite, ivorine); rubber

Dimensions

length 623mm; breadth 170mm; height 260mm

Special Collection

Cambridge Instrument Company Collection

Provenance

Donated by the Cambridge Instrument Company.

Inscription

‘Robt. W. Paul, London, N.
OHMS AT 20 C
MANGANIN’ (on top)
‘TR 2’ (on ivorine disc on front of wooden frame)

Description Notes

Rectangular wooden frame containing copper tank for oil; cast metal top; two brass terminals; four rotary switches with brass pointers and brass and ebonite handles; continuous rotation through eleven positions (0 to 10, 100, 1 000, and 10 000 ohms) marked on four annular brass dials; hole, with rubber stopper, for thermometer; each switch has ten coils wound on brass tubes arranged in circular pattern, and fastened by metal frame to underside of top plate.

Condition: fine; complete.

References

Events