![](https://coimages.sciencemuseumgroup.org.uk/73/974/large_thumbnail_1923_0159__0002_.jpg)
Original Swedish "Birka" bimetal relay with heating coil
![Original Swedish Birka' bimetal relay with heating coil](https://coimages.sciencemuseumgroup.org.uk/439/410/medium_smg00208127.jpg)
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.