Accession No

4058

Brief Description

Standard resistor, 100 international ohms, by Cambridge Scientific Instrument Company Ltd., English, c.1905

Origin

England; Cambridge

Maker

Cambridge Scientific Instrument Company Ltd.

Class

electrical

Earliest Date

1905

Latest Date

1905

Inscription Date

Material

plastic (ebonite); metal (copper, brass)

Dimensions

length 181mm; breadth 93mm; height 165mm

Special Collection

Cambridge Instrument Company Collection

Provenance

Donated by the Cambridge Instrument Company.

Inscription

on yop: “100 INTERNATIONAL OHMS / T.R. No. 7. / CORRECT AT 18 C / THE CAMBRIDGE SCIENTIFIC INSTRUMENT CO. LTD. / No. 3872”
on top (added): “NPL (logo) 3074 / NPL 8706 / NPL 11608 / NPL 33089 / NPL 61337”

Description Notes

Circular ebonite top; two copper rod connectors passing through top are bent to horizontal, and end with threaded brass terminals; hole in top for thermometer; ebonite plug; coil wound on brass pipe fixed to underside of top; cylindrical brass cover with ventilation holes in bottom and side.

References

Events