Accession No

2023

Brief Description

valve by Osram, 1/4 20th C

Origin

England

Maker

Osram

Class

physics (?)

Earliest Date

1900

Latest Date

1925

Inscription Date

Material

glass; metal (brass, white metal, copper); thread; plasticine

Dimensions

length 110mm; max diameter 52mm

Special Collection

Cavendish collection

Provenance

Transferred from Cavendish Laboratory, University of Cambridge, 1974.

Inscription

‘OSRAM
G.E.C.
MADE IN
ENGLAND
R. 4’ (stamped on side of bulb)
‘VALVE
WIRELESS RECEIVING
R. 4
PATT. No. 4411
A. 15279’ (marked on bulb)

Description Notes

Glass bulb with brass screw fitting at base. Bulb contains glass and white metal valve components, the wires of which protrude from the top of the bulb and are insulated with thread.

Condition fair; complete.

References

Events