Accession No

2071

Brief Description

vacuum tube, 1875–1925

Origin

Maker

Class

physics

Earliest Date

1875

Latest Date

1925

Inscription Date

Material

glass; rubber; metal (white metal, brass); inorganic (charcoal); wax (sealing wax); paper

Dimensions

height 400mm; breadth 445mm; depth 250mm

Special Collection

Cavendish collection

Provenance

Transferred from Cavendish Laboratory, University of Cambridge, 1974.

Inscription

"For showing charge of Cathode Rays" [Paper label around cathode]

Description Notes

Experimental/demonstration vacuum tube with central spherical chamber. Side arm with white metal anode and brass hollow cylinder target with slit through one end (connection for target passes into second side arm). Arm with hollow cylinder cathode with slot at top end. Centre of cathode tube is covered by rubber bung which plugs test-tube around lower end of cathode. Side-arm evacuation tube with long tube leading to reservoir for carbon chip vacuum regenerator. Paper label around cathode reads ‘For showing charge of Cathode Rays’.

Condition fair; complete.

References

Events