Accession No

6143

Brief Description

disappearing filament pyrometer, by Cambridge Instrument Company Ltd., English, 1956

Origin

England; London

Maker

Cambridge Instrument Company Ltd.

Class

electrical; metrology; thermometry

Earliest Date

1956

Latest Date

1956

Inscription Date

Material

Metal (steel); plastic; glass

Dimensions

length 240mm; width 115mm; height 140mm

Special Collection

Provenance

Donated on or before 23/01/2003. The donor collected instruments over many years, predominantly from private sales, some were obtained direct from the manufacturers who were going to throw them out.

Inscription

Instrument scale reads from 7 to 13 and 10 to 21, with “DEGREES C x 100” inscribed above, “CAMBRIDGE INSTRUMENT CO. LTD. ENGLAND” below, plus “LAMP 7437” and “No. L 343 944”

Description Notes

Disappearing Filament Pyrometer (a class of optical pyrometer) by Cambridge Instrument Co. Ltd, c. 1950.

Stainless steel body (painted black), with glass window, behind which is semi-circular temperature scale (700 degrees C - 1300 degrees C scale on top of ark and 1000 degrees C - 2100 degrees C scale on bottom of ark) with needle for displaying temperature. Black plastic switch on front of body enables switching “RANGE” between “LOW” and “HIGH”.

Protruding from the front of the body is a stainless steel tube lense housing with a rotating focusing ring at the far end. Attached to the back of the body is a black plastic circular casing with a rotating dial, that can be moved from the “OFF” position round almost 360 degrees. This is presumably how the operator altered the current passing through the filament. Protruding from this circular casing is the viewing tube (stainless steel) with a shaped eyepeace attached to the end, and a sliding metal button that can be compressed to introduce a red filter into the users view.

On one side of the object is a two-prong plug socket, into which the battery pack (not present with object) would be attached.

References

Events