Accession No

2021

Brief Description

valve by Osram, 1/2 20th C

Origin

England

Maker

Osram

Class

physics

Earliest Date

1900

Latest Date

1950

Inscription Date

Material

wood; glass; metal (brass, at least 2 white metals); plastic; (at least 2 types); cloth

Dimensions

length 297mm; breadth 223mm; height 165mm

Special Collection

Cavendish collection

Provenance

Transferred from Cavendish Laboratory, University of Cambridge, 09/1974.

Inscription

‘Osram
Valve
PATENTED
MADE IN ENGLAND’ (central chamber)
‘EHT
RECTIFIER
Type No. 2
26A’ (other side of main chamber)

Description Notes

Spherical glass chamber with two wide opposing arms and small evacuation side arm. White metal apparatus of valve is set down the full length from arm to arm and carries insulated electrical connections at the two ends. The whole is mounted on a contemporary varnished wooden stand.

Condition fair; complete.

References

Events