TELEPRINTER, AUTOMATIC-TRANSMITTER or
TRANSMITTER, AUTOMATIC

The Teleprinter automatic transmitter is a telegr4ph machine designed to transmit 5-unit code signals in accordance with perforations in a paper tape which has been prepared by a perforator. The machine consists basically of an a. c. or d. c. motor driving a transmitting head through a pawl and ratchet type clutch which is under the control of a tape-control unit. The transmitting head contains a paper feed mechanism and a set of cams which control the generation of the start and stagy signals and the sensing arrangements which convert the conditions on the tape to electrical signals.

The tape-control unit is positioned between the motor and the transmitting head.

It appears that they were originally called "Teleprinter, Automatic-Transmitter" and were later renamed as the "Transmitter, Automatic".

Educational Pamphlet - Outline of operation and mechanical arrangements

Teleprinter, Automatic-Transmitter No. 1B
For public circuits. Used for transmitting punched slip from Teleprinter Reperforators to Teleprinters No. 3A.

Transmits 7.5-unit signals from 11/16in. fully-perforated tape. Not suitable for use with chadless-perforated tapes. Send-receive switch fitted.

Earlier machines (Mark I) have less reliable transmitting mechanism and did not include radio-interference-suppression components.

Includes:-
1 x Block, Terminal No. 21/5.
1 x Plug, Instrument N.T. No. 3.
1 x Cord, Instrument No. 6/14F, Black, 24".
1 x Plug, for Socket-outlet No.8, with Cord 3/77L, 24".
1 x Motor, Electric, No. 25, D.C.

See E.I. Telegraphs, Teleprinter J1001.

Diagrams - TG(L) 852 and 1126

Transmitter, Automatic No. 1C
As for later version of No. 1B but having a tape-retaining plate suitable also for use with chadless tapes.

Made by Creed, their model 6S/4.

See E.I. Telegraphs, Teleprinter J1002.

Diagram - TG(L) 1126

Transmitter, Automatic No. 2A
Improved version of non-striker type machine interchangeable with No. 1B but having an enclosed motor and mechanism and low-powered motor.

See E.I. Telegraphs, Teleprinter J1011

Diagram - TG(L) 1156/0

Made by Creed, their model 6S/4.

Transmitter, Automatic No. 2B
The transmitter used is similar to the Automatic Transmitter No. 2A, but were fitted with electromagnetic clutches, so that they could be controlled from the electronic equipment, and, in addition, the numbering transmitter was fitted with tape reels, to carry the numbering tape, and associated driving mechanism.

Made by Creed, their model 6S/4M.

Transmitter, Automatic No. 2C
The transmitter used is similar to the Automatic Transmitter No. 2A, but were fitted with electromagnetic clutches, so that they could be controlled from the electronic equipment, and, in addition, the numbering transmitter was fitted with tape reels, to carry the numbering tape, and associated driving mechanism.

Made by Creed, their model 6S/4N.

Transmitter, Automatic No. 2D
Striker type automatic transmitter similar to Transmitter No. 2A machine but with improved performance.

Made by Creed, their model 6S/5.

See E.I. Telegraphs, Teleprinter J1011.

Diagram - TG(L) 1156/0

Transmitter, Automatic No. 2D/1
Has the same performance and facilities as No. 2D but will accept both 11/16in. and 7/8in. wide tapes.

Fitted with a.c./d.c. motor.

See E.I. Telegraphs, Teleprinter J1015

Diagram - TG(L) 1156/1

Transmitter, Automatic No. 2E
Striker type machine similar to No. 2D but having electromagnetic clutch-release mechanism, tape-out contacts, tight-tape contacts, 33-way signal plug.

Used on automatic switching positions and the D.T.N. teleprinter automatic switching system.

Clutch mechanism suitable for pulsed operation for release of transmitter character by character. Send-receive switch not provided.

Includes:_
1 x Motor, Electric, D.C., No. 25A.

See E.I. Telegraphs, Teleprinter J1013.

Diagram - TG(L) 1252

Transmitter, Automatic No. 2F
As for No. 2E but having motor on-speed relay and an a.c./d.c. motor. This machine will accept 11/16in. or 7/8in. tapes. This machine has a striker type transmitter and incorporates a motor on-speed relay, electromagnetic clutch mechanism, and auxiliary contacts to indicate tight-tape and tape-exhaustion conditions.

They were used on auto-telex. positions etc.

See E.I. Telegraphs, Teleprinter J1014.

Diagram - TG(L) 1328

Transmitter, Automatic No. 3A
Multiple transmitter having three independent message transmitter-heads (7.42-unit single current) with electromagnet clutch-release mechanism and tape-out contacts. Send-receive switches and tight-tape contacts are not provided.

Creed model No. 71.

See E.I. Telegraphs, Teleprinter J1021.

Diagram - TG(L) 1197

Transmitter, Automatic No. 4A
Multiple transmitter having three independent numbering transmitter-heads similar to those on No. 3A machines but with additional letter-shift-sensing mechanism. Tape reels are provided to store and wind the perforated tapes which provide prepared numbering sequences.

Usually used for automatic insertion of serial numbers, etc., on three lines prior to messages being transmitted from associated machines.

Creed model No. 72.

See E.I. Telegraphs, Teleprinter J1021.

Diagram - TG(L) 1197

Transmitter, Automatic No. 5A
Multiple transmitter having two message and one numbering transmitter-heads identical with those of No. 3A and No. 4A machines. Normally used to provide alternate use of message heads with automatic serial numbering on one line.

Creed model No. 74.

See E.I. Telegraphs, Teleprinter J1021.

Diagram - TG(L) 1197

Transmitters, Automatic Nos. 3B, 4B and 5B
Similar to Transmitters, Auto., Nos. 3A, 4A and 5A but capable of accepting 11/16in. or 7/8in. perforated tapes. Fitted with 7.5-unit transmitting camsleeves.

See E.I. Telegraphs, Teleprinter J1901.

Diagram - TG(L) 1197

Transmitters, Automatic Nos. 3C, 4C and 5C
Similar to Transmitters, Auto., Nos. 3A, 4A and 5A but fitted with 7-unit transmitting camsleeves to enable them to be remotely controlled and pulsed to transmit character by character.

Diagram - TG(L) 1197

Transmitter, Automatic No. 6A
Comprises 2 sequential message, transmitters with automatic serial number injection A. C. mains.

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