Accession No

4079

Brief Description

thermal, pointer ammeter, by Cambridge Scientific Instrument Company Ltd., English, 1918

Origin

England; Cambridge

Maker

Cambridge Scientific Instrument Company Ltd.

Class

electrical

Earliest Date

1918

Latest Date

1918

Inscription Date

Material

wood; hide (leather); metal (brass, other); glass

Dimensions

length 255mm; breadth 206mm; height 111mm

Special Collection

Cambridge Instrument Company Collection

Provenance

Donated by the Cambridge Instrument Company.

Inscription

‘MILLI-AMPERES’ (on dial)
‘...No. 36779...’ (on label, below dial)
‘No. 39725
Range
0.5 amp
to be used
with
Thermo-
ammeter
No. 36779’ (on resistance shunt)
‘No. 39726
Range
0.25amp
...’ (on second resistance shunt)

Description Notes

Wooden case; leather carrying strap; two brass terminals; glazed window showing mirror and white dial; non-linear scale, 0 to 50 divisions; zero adjustment screw on front of case; glazed window below dial showing printed maker’s and specification label. With two metal-cased shunt resistors to fit across terminals for extending current range.
Similar to Wh: 4019.

Condition: fair ( zero adjustment inoperative); complete.

References

Events