Original Swedish "Birka" bimetal relay with heating coil

Original Swedish Birka' bimetal relay with heating coil

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Original Swedish Birka' bimetal relay with heating coil
Science Museum Group
© The Board of Trustees of the Science Museum

Original Swedish "Birka" bimetal relay with heating coil, all enclosed in a vacuum tube, type 48 A/3

Details

Category:
Electricity Supply
Object Number:
1932-393
Materials:
metal (unknown)
Measurements:
overall: 110 mm x x , 31 mm,
type:
relay
credit:
Birka Regulator Co.