I know this is not Birmingham but I thought it would be of interest to see how changing from manual to automatic was described back in 1934. Taken from the Didcot Railway Centre Facebook page. What is interesting was that even if you make an automatic call from within Paddington Station you still had to go through the manual operator at the GPO Paddington Exchange if you were making an external call.
On this day in history – 28 May 1934, the private telephone exchange at Paddington station was switched over from manual to automatic operation. It was believed to be the largest privately-owned one in the country at the time. It had capacity for 100 outside lines and 1,000 extensions serving the various departments. About 12,000 calls were being handled daily. This photograph shows the new manual switchboard with seven operating positions, for external and incoming calls from Post Office and railway trunk lines. The Great Western Railway Magazine reported in its June 1934 edition:
The new system very considerably increases the rapidity of operation, because connection is established in two or three seconds by merely lifting the receiver and dialling the desired number, and replacement of the receiver instantly clears the line and permits of further calls. The new equipment is one of the largest privately-owned installations in this country. Its present provision is for seven hundred lines with an ultimate capacity of a thousand lines. The system is on a “step-by-step” principle and similar to that installed in public exchanges for the General Post Office.
Each extension telephone is fitted with a dial which makes a definite number of breaks in the line circuit according to the number selected on the dial, and the impulses thus set up are transmitted to the apparatus in the exchange. When the fourth digit is dialled it causes the bell to ring. At the same time the “ringing tone” is “fed back” to the caller’s instrument, indicating that the distant end is being rung. Should the called number be engaged, the “engaged tone” will be heard by the caller, and if a number not in use, or temporarily out of service, be dialled, the “number unobtainable tone” will be heard by the caller.
For Post Office local calls, the caller dials “9” only, and is then connected to the Paddington Post Office exchange, where the operator deals with the call in the usual way. At a later date, when Paddington Post Office exchange becomes automatic, it will be necessary to dial “9” followed by the exchange letters and number as shown in the Post Office telephone Directory.
To enable connection to be made to such circuits as railway trunks, omnibus lines, and party lines (which are not dealt with automatically) and to deal with incoming calls from the Post Office, a manual switchboard is provided. It consists of seven operating positions, each position being equipped with seventeen cord circuits. The seven hundred automatic extension lines appear along the switchboard on every operating position, so that each of the seven operators have access to all extension lines. This equipment, known as a “multiple”, appears in the top portion of the switchboard.
For incoming calls the lines appear once again in the lower portion of the switchboard, together with calling lamp apparatus. When any automatic line dials “0” – signifying that the operator is required, a lamp, corresponding with the extension line originating the call is lighted on the appropriate operating position. Other lines terminating in the lower portion of the switchboard are railway trunks, omnibus lines, party lines, and incoming Post Office junctions.
The manual switchboard also has a selection of outgoing Post Office lines to enable Post Office toll and trunk calls to be dealt with. Some idea of the extent of the telephone work dealt with at the Paddington exchange may be gained when it is mentioned that on a recent normal day between 9.0 am and 6.0 pm there was a total of over 12,000 calls. This was, approximately, 22 calls a minute, and averaged, for each operator, one call every 25 seconds.
The whole of the apparatus is British made, having been manufactured and installed by the General Electric Company Limited, under the supervision of Mr C M Jacobs, the Great Western Railway Company’s Signal and Telegraph Engineer.
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