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POST OFICE  RELAY 'B' No 14802, 1920's

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POST OFICE RELAY 'B' No 14802, 1920's

Relay used in telegraphy acting as a form of amplifier for the signal, sensitive coils moved the contacts which controlled equipment that could be powered locally.

Post Office Standard Relay B

This relay replaced earlier forms known as A having coils of 100 ohms instead of 200 and being shorter in length. Relay B also sometimes having differential coils (two winding on each coil) It can be of the polarised (see item A0239) or non polarised type the polarised version has a magnet and can be neutralised, as in use with the double plate sounder item A0227, provided it has double throw contacts, which means the pole or tongue T is held between M(mark) and S(space) contacts.

The relay shown only has a single throw contact, and is not polarised (no Magnet).

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A0278



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