Relay unit - RD 8498. Consists of two rectangular brackets , blue grey colour. In one side sits the relay, in the other is a mercury switch connected to bayonet light fitting.
Processed Material/Metal
Processed Material/Metal/Copper
Processed Material/Metal/Mercury
Signature/Marks and Type
RELAY UNIT / RD8498 Printed
G.P.O. Impressed
Accession No
Credit Line
Relay Unit, 1982.99. The Museum of Transport and Technology (MOTAT).

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This is a "Float Level" switch. the mercury would close or open the circuit when the angle of the whole thing is moved over.

- Steve Miller

Posted on 24-04-2020 02:29:37