Re: 1920s Direct line telephone/intercom
The same terminal labelling is found in the "telephones" section of the GEC catalogue of 1892. Different models use different combinations of the same set of letters, and the MC, ZE, C, and L configuration is only used on a "Hunnings Cone" model, made under licence form the NT Co.Ltd, which has two additional terminals B, B for a "detached bell". The wooden base looks just like that of the "Manchester Microphone" model, but this uses a different configuration of letters, and needed three cells. The "Hunnings Cone" Model was said to require "two agglomerate cells or two dry cells".
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