TELEGRAPH MACHINES USED IN THE CTO

These are pictures of Telegraph sender and receiver units as used in the CTO.  This is not a complete list of all those used by the GPO.

Documentation
Baudot Multiplex Type Printing System
Hughes Type Printing Telegraph
Morse Keyboard Perforators
Telegraph Concentrators
 

Baudot keyboard (Mark 4) - 1921
The form holder is called a Desk No. 7 and can be removed from the keyboard.

Baudot keyboard Type 4 - 1927

Baudot Keyboard Mark 5 - 1931
The form holder is called a Desk No. 7 and can be removed from the keyboard.
Fitted with a Plug No. 906.

Baudot receiver - 1921

Baudot receiver No. 2 - 1923

Baudot receiver No. 4 - 1926

Hughes printer - 1921

Wheatstone Receiver - 1901

Hughes Repeater - 1912

Morse Inker Mechanical No. 1 - 1918

Morse inker mechanical No. 2 - 1918

Morse key - Called a Key, Single Current

Morse key with vibrating sounder - 1906

Morse perforator - 1915
The operator uses the two hand stamps to push down the three plungers on the perforator to perforate the paper tape
The centre plunger is a space and the outer plungers dot and dash
The operators could work at some speed

Teleprinter No. 3 - 1929

Teleprinter No. 11A
E.I. Telegraphs, Teleprinter D1001

Teleprinter No. 11C

Wheatstone motor driven transmitter - 1914

Wheatstone perforator No.1 and paper box - 1920

Wheatstone receiver - 1915

Last revised: September 12, 2023