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The 3000 type relay evolved from a number of designs by different manufacturers, as Volume 27 Part 1 of the Post Office Electrical Engineers Journal, April 1934 explains... |
"The Introduction of the Standard Telephone Relay" By R.W. Palmer.
...The Post Office therefore decided to standardize one type of relay, the best that could be designed in the light of past experience, and to require all contractors to supply this one type, models of which would be designed for particular circuits in close co-operation with the Department. A proposed standard telephone relay was designed by Messrs. Ray and Biddelcombe, of the Post Office Engineering Department, in co-operation with the contractors, and was described in this Journal in October, 1931.
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This type of relay, now known as the 3000 type, was adopted as standard in 1932. |
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