Accession No

4228

Brief Description

electronic valve voltmeter, thermionic voltmeter, by Cambridge Instrument Company Ltd., English, 1927

Origin

England; London

Maker

Cambridge Instrument Company Ltd.

Class

electrical

Earliest Date

1927

Latest Date

1927

Inscription Date

Material

plastic (ebonite); wood; glass; metal (brass)

Dimensions

length 194mm; breadth 160mm; height 90mm

Special Collection

Cambridge Instrument Company Collection

Provenance

Donated by the Cambridge Instrument Company.

Inscription

‘VOLTS
CAMBRIDGE’INSTRUMENT CO. LTD.
ENGLAND
No. L 23316 (with logo)’ (on dial)
‘CAMBRIDGE THERMIONIC VOLTMETER.
MOULLIN PATENT No. 195698’ (on top)

Description Notes

Ebonite top on wooden box; circular glazed window on front of box; circular window and dial; non-linear scale, 0 to 1.5 divisions; three pairs of brass terminals above window, marked ‘APPLIED POTENTIAL’, ‘6 VOLTS’, and ‘70V’; zero adjustment and clamping controls below window; filament rheostat control and push-button switch on right side; two ebonite rotary switches.
Similar to Wh: 3339.

Complete.

References

Events