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The Telegraphist's Vade Mecum, and Vocabulary of the English Language, Numerically, and Alphabetically Arranged, on New Principles, Calculated for the Various Symbols Used for Telegraphic Correspondence, from the Homograph to the Semaphore and Crescent, by Single and Double Numerical Tables, Applicable to Naval, Military, Commercial, and Official Messages on Any Subject, in the Most Simple, Comprehensive, and Expeditious Manner
Joseph Conolly
其他書名
With an Unlimited Variety of Secret Keys for Confidential Messages, Illustrated by Plates of Flags, and Changes on the Two-armed Semaphore: Exhibiting at One View the Extraordinary Semaphoric Power in Giving Two Distinct Numbers in Every Simultaneous Movement of the Signals
出版author, 1818
URLhttp://books.google.com.hk/books?id=F43mTPaPvpQC&hl=&source=gbs_api
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