Accession No

5750

Brief Description

electrometer, Kershaw dosimeter, by Philip Harris Ltd., English, 1940-1999 (c)

Origin

England; Birmingham and London

Maker

Philip Harris Ltd.

Class

electrical

Earliest Date

1940

Latest Date

1999

Inscription Date

Material

metal (copper, other); plastic; glass; paper (cardboard)

Dimensions

height 145mm; diameter 80mm

Special Collection

Provenance

Donated by Anglia Polytechnic University (now Anglia Ruskin University), Cambridge, on 10/09/1999.

Inscription

‘KERSHAW DOSIMETER Q.F. No.1. Mk.II
MADE IN ENGLAND’ (on micrometer eyepiece)
‘6665 0055’ (clip on micrometer eyepiece)
‘6032’ (on eyepiece body)
‘Harris’ (top of case)
‘HARRIS.
P. 7992 EB.
Electrometer
base.’ (written on base)
‘A HARRIS MODERN PHYSICS PRODUCT
Cat. No. P 7992
ELECTROMETER
+ BASE(S)
PHILIP HARRIS LTD. BIRMINGHAM 3 ENGLAND
FRAGILE’ (labels on box lid)
‘ELECTROMETER’ (x4 round lid of box)

Description Notes

Electrometer. Grey metal cylinder, open bottom. Top is covered by a plastic (glass?) disc. Two terminals on top, one red, one black. From the red terminal a metal plate extends, and is connected to a plastic-surrounding-metal push-button. When depressed, the button links the terminal to a metal rod which is suspended in a prism, and extends freely into the centre of the metal case. The other end of the rod extends from the prism into the centre of a hole in a metal block which is attached to the top of the case. Metal screw goes through the block and into the hole to secure the micrometer eyepiece which fits here. Micrometer eyepiece is a metal tube, with lenses at both ends. Metal clip attached round body. Scale is 0 to .5, by .1, subdivided to .05.
Two grey metal circular bases; two plastic cylinders. Cardboard box.

Condition: good; complete.

References

Events