Accession No

2078

Brief Description

vacuum tube, 1/2 20th Century

Origin

Maker

Class

physics

Earliest Date

1900

Latest Date

1950

Inscription Date

Material

glass; metal (copper, white metal, brass); inorganic (charcoal); cloth (cotton wool)

Dimensions

length 490mm; breadth 330mm; height 160mm

Special Collection

Cavendish collection

Provenance

Transferred from Cavendish Laboratory, University of Cambridge, 1974.

Inscription

Description Notes

Vacuum tube with spherical chamber at one end. White metal anode terminating in flat disc, set in side arm to chamber. Rectangular white metal target in chamber with terminal set in side arm. Long arm for cathode which consists of two copper wires passing to brass terminal outside the tube, and ending in the chamber in a thin sheet of white metal foil. Side arm to evacuating pump with stopcock and test tube attachment containing charcoal to act as vacuum regulator.

Condition good; complete.

References

Events