Development history of the telephone
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- These are extracts from the minutes from
the British Telephone Technical Development
Committee, Subscribers Apparatus Development
Sub-Committee meetings which were held every
3 months. These were run by the GPO and held
on their premises. The GPO contractors also
attended these meetings. The minutes started
around 1942 and finished in December 1967
due to the re-organisation of the Post Office.
The minutes on this page show the development of the Telephone No. 706 which was latterly running alongside that of the 700 type set. All the following minutes refer to the "700 Type Telephone" - but in reality it is the Telephone 706. 11th July 1956 The Chairman said that the Department had already gone out for contracts for next year's purchase of telephones and none of the new 700 type was included: unless rapid response was made within the next few months, we would be in no better position next year. The Manufacturers had already been informed of the criticism of the proposed case and had been asked to submit new designs; one had already been received. He hoped that it would be possible for the P.O. to decide requirements by the end of the six months the Manufacturers had been given for the submission of designs and to get a trial started. It might just be possible for manufacturers to get tooled up for production next summer, but time would be tight and there would need to be the closest collaboration on both sides. The P.O. would aim to have agreed drawings and specification available by next June-July. In reply to Mr. Lewis (S.B.) , he said he was unable to say how soon after the target date for submissions of designs the P.O. would be able to issue a SCP, and if the Manufacturers thought it possible to get into production if the SCP were issued by Christmas, Mr. Paren (T.A.C.) replied that if the design were settled by then, production in 1957/58 could be considered. Mr. Redington (S Branch) said that while the quantities to be ordered would need to be settled early in the year, the decision as to the type (i.e. 332 or 700) might be deferred until about June. In conclusion the Chairman said that from the P.O. point of view, if the model chosen were based on the 700 type telephone and entailed the minimum element of risk, the P.O. would be prepared to order on sample. He added that the P.O. was not necessarily wedded to the SCP 134 shape handset, provided that the distances between the microphone and receiver were unchanged. As many models as possible were required (net necessarily based on the 700 type) so that an exhibition could be staged to enable the Directorate to choose a design. 10th October 1956 Mr. Warren (T.A.C.) said the Manufacturers had responded to the invitation to submit designs of new telephones within the target date and the position was as follows:- E.T. and G.E.C. had submitted a joint design (SCP 141), S.B. had offered an Addendum to SCP 132, A.T.M. information had been submitted to S Branch with the proposal that it should be issued as an Informative SCP; Phoenix had also supplied a wooden model. Samples or wood models had been sent to the P.O. for the telephones covered by SCP 141 and SCP 132. E.T. and G.E.C. individually would also submit alternative designs, samples of which were available. Informative SCP's would be issued to cover those designs not already the subject of SCP's. The Chairman thanked the Manufacturers, for the industry and zeal that had gone into their response to the invitation, the P.O. did not intend to be too inflexible on the question of the target date, which was due to expire on 11th October, but he hoped to be able to say that the BTTDC meeting on 25th October that all available information had been received, The Manufacturers would thus have a few extra days in which to make good any belated offers. He added that the Chairman of BTTDC hoped to be able to prepare engineering comments on the individual designs for presentation to the Administration and to have a decision from them by mid-November. He hoped that in any case a decision would have been taken by the next SSC meeting, although if it were given earlier, the P.O. would not delay in advising the Manufacturers before the meeting. Mr. Combridge (S Branch) pointed out that the wooden models did not enable the reliability of the mechanism to be assessed, working models were needed before the P.O. could judge relative merits with confidence. The Chairman agreed, but said sometime was allowed for detailed engineering work as the aim was to order next summer. He commented that some of the designs had a tray while others had not; some wore capable of incorporating press-button "switchery" whereas others catered only for minimum facilities. It was essential that any choice should be as between like and like, and cost would he a basic factor in comparisons. He asked that the Manufacturers provide an indication of the cost differential between the different models and between the alternative facilities provided. He emphasised that detailed costing was not what he was asking for. He said that this information would be required in about two weeks. Mr. Paren (T.A.C.) said he would represent the P.O.’s requirements to the T.A.C. and would bear the objective in mind the time limit would make it a difficult assignment. He asked if the cost studies were to be made irrespective of the colour of the material used. Mr. Bendall (Phoenix) commented that the P.O. had not yet indicated whether materials other than Diakon were acceptable. The Chairman said the P.O. could not at this stage tie the Manufacturers to the use of any particular material, but they should indicate where appropriate what material, they intended to uses The cost estimate should be based on black telephones. Mr. Combridge (S Branch) said that in order to make the issue clear, the price should be in respect of a complete telephone, i.e. a telephone complete with transmitter, dial, receiver and cords. The Chairman agreed and said the P.O. was thinking in terms of the 700 type telephone circuit with a redesigned case. The maximum requirement would be a telephone fitted with key No. 304. (or equivalent facility) and the minimum requirement a telephone without a key but capable of taking a Key No. 302 (also a thermistor and rectifier for shared service where required) as an optional fitting. Mr. Paren (T.A.C.) inquired the position regarding the stipulation that the shape of the earpiece, mouthpiece, distances and angles should not be altered. Mr. Combridge (S Branch) replied that this stipulation stood, as any departure from the conditions of the 700 type circuit would mean further trials. The Chairman concluded the discussion by saying that it was appreciated that the Manufacturers had been set a difficult task to complete in a short time, but they would appreciate that the matter was an important one for all concerned, For its part, the P.O. aimed to get a decision from the Administration at an early date, which would be a big step forward. |
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