The BT Museum Memorial Pages

Telephony Items

The Consolidated Telephone

Consolidated Telephone I can't find any information about the Consolidated Telephone Company, other than the address printed on the exhibit, Telephone & Electrical Works, Farringdon Road, London E.C. Notice the curious microphone shaped like a shallow dish.



National Telephone Company Wall Telephone

NTC wall telephone The separate microphone in its own box is the Blake transmitter, invented by Francis Blake in 1877 and later improved jointly with Emile Berliner. One contact was of metal and the other of carbon. The changes in pressure from the sound waves caused the microphone resistance to change, thus varying the current. The Blake transmitter was a standard feature of Bell Company telephones for a number of years until ousted by the White solid-back transmitter, following a patent exchange with Edison. The receiver is of the Bell "butterstamp" pattern. This instrument dates from about 1879-80.



BPO Wall Telephone

BPO Wall Telephone The standard wall telephone, Telephone No 1, used by the British Post Office for many years in the first quarter of the century. The transmitter is fixed to the back plate, as the 'solid back' design of carbon microphone functioned best when kept vertical - compare with the similar vertical alignment on the candlestick model. The microphone height could be adjusted to suit the speaker. This model is for central battery working.



3-Line Cord Switchboard

3-line cord switchboard A small switchboard for use in a shop or private residence. Calls were indicated by the flap indicators at the top. When the line was rung the latch holding the flap lifted allowing the flap to drop, indicating the call and connecting a buzzer to call attention. Calls were connected by inserting the plugs into the sockets as seen. The weights hanging below pulled the cords back into position when the plug was removed. A separate telephone instrument was provided.



Ornate Cord Switchboard

Ornate cord switchboard This ornate example of a cord switchboard was fitted in a residence. The top label reads "2947 Mayfair Exchange". The sockets are labelled "Exchange" "Speaking set 1" "Malton 1" "New Court" and "Malton 2". As can be seen, the telephone or "speaking set" was integral to the switchboard.



Lorimer Automatic Telephone

Lorimer telephone A number of different automatic telephone system were tried out by the Post Office besides the Strowger dial system which eventually became universal. The caller selected the number desired by setting the levers on the front of the telephone. Only one exchange of this type was ever installed and that was at Hereford in 1914.



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Exhibits: British Telecom Collection
Photos: copyright Sam Hallas 1992-1997

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