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Old 27th Apr 2019, 10:34 pm   #2
russell_w_b
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Join Date: Jul 2007
Location: Penrith, Cumbria, UK.
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Default Re: When was the No 12 dial introduced

Atkinson's 'Telephony, Vol: 1' refers to a 'new type of dial in which the slipping cam has been eliminated' and refers to it as the trigger dial. There is no mention of it being 'Dial, No:12' but there is a photograph and it has the number 12 stamped on it.

This book was first published in 1948.
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