Semaphore Alphabet : And Numeral Signs for the Army by Anon (2018, Trade Paperback)
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Information is encoded by the position of the flags; it is read when the flag is in a fixed position. Semaphores were adopted and widely used in the 19th century. Semaphore could usefully be employed at short distances, as between columns and their advanced guard, or rear guards, across rivers, or fire swept zones, and to connect an attacking line with its supports.