Signaling

Is of remote origin. A rude code of signals addre ed to the eye is common among the savage races of the present day, and doubtle existed from the earliest times among the historical races. The Indians of the great plains of North America avail themselves for night-signals of fires lighted on elevated points, and of dense clouds of smoke made by suddenly heaping green brush upon a fire for day-signals. Gen. Marcy, in his “Army Life on the Border,” shows that similar signals can be used in this region with great advantage by troops engaged in Indian campaigning. Me ages exchanged in this way must be preconcerted. This method of signaling dates from a remote antiquity. Alphabetical signaling—a system in which a written language is conveyed by means of its elements—is first described by Polybius, about 260 B.C. , and seems to have been devised, or at least greatly improved by him. He formed a code by arranging the letters of the Greek alphabet in several columns. A given letter was represented by a number of lanterns or torches or other signals, which gave the number of the column, and a second set of signals giving the number of the letter in the column. Capt. John Smith, of Virginia fame, is said to have used the system of Polybius during the siege of Vienna. Alphabetical signaling thus early adopted remained without improvement, and too cumbersome for general application till recent times. Me age signaling by torches, flags, and rockets has been generally used, especially at sea, where it has a wide application both in war and commerce. The signals usually represented numbers, which were referred to printed codes. The invention of the magnetic telegraph led to the Morse alphabet, which crystallized the hitherto vague idea of representing letters by the combination and arrangement of a few simple elements. In the general service code of the United States, there are used two elements. These can readily be represented by sounds, motions, numbers, colors, etc. The ordinary method of signaling is by waving a flag by day and a torch at night. See also Telegraph, Field .