Telephone used in Automatic exchange areas.
Mk 234 differed from Mk 235 as the Mk 234 had the terminals R and TR omitted.
Fitted with a transmitter No. 1, Receiver Bell No. 1 a Dial No. 3 or 8.
Made by Siemens.
It would have been introduced when the first SB&Co. exchanges were brought into service, which was in 1918 (Grimsby), Stockport (1919) and Southampton (1923). It was probably used on the Siemens RAX at Ramsey (Hunts.) in 1921 as well.
There were no SB&Co. public exchanges in Britain before the Great War. The Siemens Brothers works in Woolwich had an auto PABX but this almost certainly used German Siemens telephones with monster 'half moon'-type dials.
Superseded by Telephone No. 121.
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