Accession No

2074

Brief Description

vacuum tube, 1/2 20th Century

Origin

Maker

Class

physics

Earliest Date

1900

Latest Date

1950

Inscription Date

Material

glass; metal (copper, at least two types of white metal); wax; cloth (waxed cloth tape)

Dimensions

length 450mm; breadth 260mm; height 130mm

Special Collection

Cavendish collection

Provenance

Transferred from Cavendish Laboratory, University of Cambridge, 1974.

Inscription

Description Notes

Glass vacuum tube with central spherical cavity. White metal anode in side arm to sphere, with white metal disc at end. White metal cathode ending in concave disc set in open-ended glass tube. The cathode can be moved into or out of the central chamber. Side arm with glass and white metal rod, turned by glass tap. Opposite this a side arm with a stop cock, which would connect to the evacuating pump.
This is an experimental demonstration tube.

Condition fair; complete.

References

Events