Accession No

2043

Brief Description

Coolidge type X-ray tube, by the British Thomson-Houston Company, English, 1913 (c)

Origin

England; London; 77 Upper Thames St; Mazda House

Maker

The British Thomson-Houston Company

Class

physics

Earliest Date

1913

Latest Date

1913

Inscription Date

Material

glass; metal (brass, copper, at least 2 white metals); paper; cloth (cotton wool)

Dimensions

length 540mm; maximum diameter 155mm

Special Collection

Cavendish collection

Provenance

Transferred from Cavendish Laboratory, University of Cambridge, 1974.

Inscription

‘COOLIDGE
B
T-H
TUBE
PATENT NO 14892/13’ (etched into main chamber)
‘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 THOMSON-HOUSTON CO LD
MAZDA HOUSE
77 UPPER THAMES ST. E.C.’ (etched into anode tube)

Description Notes

Purple-tinted spherical glass chamber with opposing tubes carrying electrodes, Cathode is mounted with screw-fit brass fitting. Angled target on end of anode. Paper label marked ‘Medium Focus’.

Complete.

References

Events