The handbook of communication by telegraph :
describing the various methods either by flags or other semaphores : and the machines in use at the admiralty : at Liverpool and Holyhead : at Hull, at London, and other stations of the general coast telegraph establishment : with engravings.

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Language(s)
English
Published
London : H.K. Causton & Co., 1842.
Subjects
Telegraph.
Cipher and telegraph codes.
Physical Description
60 p. : col. ill. ; cm.
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