Transmitter No. 1
Solid back transmitter. Known as a Mark 4001.
Standard Transmitter for C.B. telephones.
Uses a Mouthpiece No. 4.
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| Transmitter No. 2 Standard
Transmitter for L.B. telephones.
Uses a Mouthpiece No. 4.
Telephone mouthpiece sanitisers |
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| Transmitter No. 3 L.B. Deckert
transmitter
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| Transmitter No. 4 L.B. Breastplate
transmitter used by operators on primary battery trunk exchanges.
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| Transmitter No. 5 C.B. Breastplate
transmitter used by operators on secondary battery trunk exchanges.
Includes:-
1 x Conn., Mouthpiece, No. 6.
1 x Loop for Bands, Transmitters, Breast Plate, Slotted Hole.
1 x Mouthpiece No. 6 (Mk. N.T. 9).
18" Web, Non-elastic, No.2, Grey.
Superseded by Transmitter No. 23A
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| Transmitter No. 6 L.B. Transmitter
used on Telephones No. 3.
Uses a Mouthpiece No. 5.
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| Transmitter No. 8 Used on C.B.
exchanges with Arm Transmitter No. 2.
Fitted with a Mouthpiece No.
4.
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| Transmitter No. 10 L.B. type for
Telephone No. 28, except Mark 234.
Includes:-
1 x Transmitter, Inset, No. 3.
To be requisitioned separately:-
1 x Conn., Mouthpiece, No. 1.
1 x Mouthpiece No. 1.
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| Transmitter No. 13 C.B. transmitter
for use on Telephone No. 57.
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| Transmitter No. 16 L.B. transmitter
used on Electrophone Stage Circuits.
Fitted with an Angelini type
transmitter and used a Mouthpiece No. 13.
The Mark 234 (not an Angelini) model used a Transmitter, Inset No. 9.
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| Transmitter No. 17 Fitted on Tables,
Electrophone, NT.
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| Transmitter No. 21 Used for
signalling deposits of coin in prepayment coin collecting boxes.
The operator could hear the bell or gong sound via this transmitter.
Fitted to Coin Mechanisms.
This transmitter includes a Bell Gong No. 18.
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| Transmitter No. 22
Used on C.B. and L.B. telephones etc.
Introduced early 1930's and superseded the Transmitter No. 1 and 2.
Includes:-
1 x Mouthpiece No. 16.
1 x Transmitter, Inset, No. 13.
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| Transmitter No. 23 C.B. or L.B.
moulded Breast Plate type with switch facility (later supplies
distinguished from 23A by circular yellow spot).
The switch disconnected battery feed to the transmitter, when the
mouthpiece was moved away from the mouth.
Transmitter No. 23 includes:-
1 x Loop for Bands, Transmitters, Breast Plate, Slotted Hole.
1 x Mouthpiece No. 17 or No. 19.
1 x Transmitter, Inset, No. 13A.
18" Web, Non-elastic, No. 2, Grey. Transmitter No. 23A includes:-
1 x Transmitter, Inset, No. 13AA
Otherwise as for Transmitter No. 23 Supersedes Transmitter No. 5A.
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