Accession No

3336

Brief Description

variable capacitor, by Cambridge Instrument Company Ltd., England, 1920-1930 (c)

Origin

England

Maker

Cambridge Instrument Company Ltd.

Class

electrical

Earliest Date

1920

Latest Date

1930

Inscription Date

Material

wood; hide (leather); metal (brass, aluminium); plastic (ebonite, ivorine)

Dimensions

length 184mm; breadth 151mm; height 212mm

Special Collection

Provenance

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

Inscription

‘No. 175835’ (on dial)
‘W/T’ (on front of box (added))

Description Notes

Rectangular wooden box with leather handle and two brass mounting plates; ebonite top; two brass terminals; circular ivorine dial on top; circular-arc scale, about 180 degrees, from 0.2 to 5.1 milli-microfarads (hand-drawn and lettered); knurled ebonite knob; brass pointer with locking screw; inside box, two sets of fixed, semicircular aluminium vanes, and a similar two sets of parallel moving vanes attached to central spindle.

Condition: good; complete.

References

Events