Accession No

3339

Brief Description

electronic valve voltmeter, thermionic voltmeter, Moullin patent, by Cambridge Instrument Company Ltd., English, 1924

Origin

England; London

Maker

Cambridge Instrument Company Ltd.

Class

electrical

Earliest Date

1924

Latest Date

1924

Inscription Date

Material

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

Dimensions

length 195mm; breadth 159mm; height 150mm

Special Collection

Provenance

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

Inscription

‘No. L 10731
CAMBRIDGE
INSTRUMENT CO. LTD. ENGLAND
PATT. I’ (on dial)
‘CAMBRIDGE THERMIONIC VOLTMETER
MOULLIN PATENT No. 199483’ (on top)

Description Notes

Ebonite top on wooden box; four sided, arched, glazed window showing white dial; non-linear scale, 0 to 1.5 divisions; two pairs of brass terminals above window, marked ‘APPLIED POTENTIAL’, and ‘6 VOLTS’; zero adjustment and clamping controls below window; filament rheostat control and push-button switch on right side.

Condition: good; complete.

References

Events