Title: The telegraph dictionary, and seamen's signal book, adapted to signals by flags or other semaphores; and arranged for secret correspondence, through Morse's electro-magnetic telegraph: for the use of commanders of vessels, merchants, &c.
Authors: Rogers, Henry J., 1811-1879.
Publisher: F. Lucas, Jr.
Year: 1845
Subjects: Merchant marine Signaling; Cipher and telegraph codes Merchant marine.