TELEPHONE No. 4 | |||||||||||||||||||
Introduced around 1911, this Local Battery Pedestal (Candlestick) telephone, with no dial aperture, was used on CBS and Magneto exchanges. It was used in conjunction with a Generator No. 4CN. This telephone was also known as the "Telephone, Table, P.B., Transmitter Type", but later renamed as the Telephone No. 4. CBS No. 1 - Table telephone if used with Bellset No. 5. The Transmitter No. 2 would have Label No. 78 fitted between the speaking tube and the transmitter body. This label advised of the Exchange name and number. The switch hook consists of two change-over type contact
sets. This was the standard telephone instrument arranged for standing upon a table. Since this telephone is simply a transmitter, a receiver, and a gravity switch, the instrument is not complete, and a separate hand generator is provided, usually fixed to the desk or table in close proximity to the table telephone; the induction coil and magneto bell, with the condenser (should one be required), are fitted in a case and are known as a Bell Set. The bell set for use with the telephone is Bell Set No. 5, if the condenser is not necessary, and Bell Set No. 15 if a condenser is required. The bell set need not be fitted close to the telephone so long as it is within audible distance of it. The primary battery is placed in a battery box and fitted close to the bell set to which it is connected. The Gravity switch is a new design where the contact springs are operated by an Ebonite rod. This ensures that the receiver hook is insulated from the line, in case of a high voltage contact between external overhead cables. The switch hook springs consist of a make and a changeover contact set. The telephone could also be fitted with a Watch Receiver and this would hang on a Hook, Receiver D, which would be fitted10015 to the neck, under the transmitter. There are a number of revisions to this telephone (Marks 234 to 236). The Mark 236 is fitted with a Transmitter No. 22. Early table telephones were connected to the internal wiring with a Strip, Flexible Cord Connection. Click here for more information. Uses a Label No. 78 or 160 for dialling instructions and number presentation. Superseded by the Telephone No. 156. Telephone includes (1928):- To be requisitioned separately if required:- Telephone includes (1946):- Circuit diagrams - EC1065 (Dated 1917) and N104. Diagram - CBS 265 (CBS 1 and Magneto - Non condensered). Drawings - 10015, 9544 & 62901 (Mark 235 dated 1911). Specification - D202. Made obsolete in 1947 and superseded by Telephone No. 156LB in 1936. When fitted with a Transmitter No. 2 the exchange number label is a Label No. 78. See also the Telephone Efficiency Committees Report on Local Battery Area telephones. Click here for pictures of a Candlestick before refurbishment Click here for Candlestick construction and how to dismantle the phone Candlestick Manufacturing (Messrs Keitmann) Collectors Information - what to look for Telephone mouthpiece sanitisers Terminal Markings
Telephone No. 4 Mark 236
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Last revised: July 02, 2024FM |