Accession No

3340

Brief Description

light meter, used at the Engineering Labs, University of Cambridge, by British Thomson-Houston Company and Compagnie des Lampes, English, 1932

Origin

England; London; W1; Newman Street; Mazda House

Maker

British Thomson-Houston Company [main instrument] Compagnie des Lampes [galvanometer]

Class

optical

Earliest Date

1932

Latest Date

1932

Inscription Date

19-8-1932

Material

metal (brass, at least three white metals); paper (card and one other); glass; hide (leather); cloth

Dimensions

length 196mm; height 155mm; depth 40mm case length 210mm; breadth 169mm; depth 54mm

Special Collection

Provenance

Transferred from Department of Engineering, University of Cambridge, Cambridge, England, 01/1986.

Inscription

‘The British Thomson-Houston Co., Ltd.
mazda house, newman street, oxford street, w.1.’ (inside back of box)
‘ENG LAB
CAMB UNIV’ (brass plaque on case and front of box)
‘Cie. DES LAMPES’ (galvanometer)

Description Notes

Black-painted white metal box with aperture on the left at the front through which galvanometer can be viewed. This is a moving pointer reflecting galvanometer with calibrations marked for ‘1/100’, ‘1/10’, ‘1’ and ‘2’. Knob on right of box with attachment to rheostat for zeroing galvanometer needle. Hinged cover to scale for ‘Illumination’ in ‘Foot Candles or Lumens per Sq. Ft.’, divided 1.2 - 50. Back of box hinges out to reveal rheostat and instructions for use; this also gives date of calibration as 19-8-1932. Leather carrying handle.
Leather case with leather carrying handle and white metal lock (key still present).

Condition good; complete.

References

Events