Accession No

2080

Brief Description

vacuum tube, 1/2 20th C

Origin

Maker

Class

physics

Earliest Date

1900

Latest Date

1950

Inscription Date

Material

glass; metal (copper, white metal, brass); wood; rubber; inorganic (charcoal); cloth (cottonwool)

Dimensions

height 725mm; breadth 185mm; length 228mm

Special Collection

Cavendish collection

Provenance

Transferred from Cavendish Laboratory, University of Cambridge, 1974.

Inscription

Description Notes

Experimental/demonstration tube set onto wooden mount. Glass tube with spherical chamber at one end. White metal anode terminating in flat disc. Oppoiste the anode is a long arm for incandescent 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 two stopcocks and test tube attachment containing charcoal to act as vacuum regulator.

Condition fair; complete.

References

Events