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Old 1st May 2013, 10:19 pm   #203
emeritus
Dekatron
 
Join Date: Jan 2012
Location: Brentwood, Essex, UK.
Posts: 5,316
Default 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.
Attached Files
File Type: pdf Belling-Lee Aug 1952 speaker plug.pdf (90.7 KB, 260 views)
File Type: pdf Bulgin 1936 speaker plugs.pdf (124.2 KB, 245 views)
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