Re: Another unusual plug and some other questions
My school had 3-pin sockets of this type in some classrooms too. A 1952 Belling-Lee catalogue identifies the 3-pin plug type as being in accordance with BS666.
The 1936 Bulgin catalogue has 2 pin [unillustrated] and 4 pin [similar configuration] types, the 4 pin type being for use with speakers having energised field coils.
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