Accession No

2045.2

Brief Description

Coolidge type X-ray tube, by The British Thomson-Houston Company Ltd., English, c. 1913-1923

Origin

England; London; 77 Upper Thames Street; Mazda House

Maker

The British Thomson-Houston Company Ltd.

Class

physics

Earliest Date

1913

Latest Date

1923

Inscription Date

Material

glass; metal (brass, copper, at least two white metals); paper

Dimensions

length 495mm; maximum diameter 110mm

Special Collection

Cavendish collection

Provenance

Transferred from Cavendish Laboratory, University of Cambridge, 09/1974.

Inscription

‘30MA
COOLIDGE TUBE
B T-H
PATENT NO 14892/13
MADE
[IN U.S.A.]
34681’ (on bulb)
‘PATENT NOS. 14892 of 1913
and 25849 of 1913
PATENTS PENDING
THIS TUBE IS NOT LICENSED TO
BE RE-EXHAUSTED OR REPAIRED,
NOR IS THE METAL HEREIN CON.
TAINED LICENSED TO BE USED
EXCEPT IN THIS PARTICULAR
[TUBE]

[THE BRITISH THOMS]ON-HOUSTON CO.LD.
[MAZDA] HOUSE
[77 UPPER THAMES] ST. E.C.]’ (etched into tube)
‘X-RAY TUBE
SUPPLIED BY
WATSON & SONS (ELECTRO-MEDICAL) Ltd.
Sunic House, P[arker Str[eet], Kingsway, W.C.2.
No.891 Date 12/12/1923 ‘ (paper label)

Description Notes

Purple tinted spherical glass chamber with opposing tubes carrying electrodes, Cathode is mounted with screw-fit brass fitting. Concave cathode, angled target on end of anode. At the end of the anode tube is radiator coil for air-cooling.

Condition good; complete

References

Events