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Development was rapid and continuous, and, by 1914, it was adopted and in extensive use by all the armies and navies of the world.It soon became apparent that wireless telegraphy was not an unmixed blessing to armies and navies, because it lacked secrecy and messages could be heard by the enemy as well as by friendly forces.The beam was interrupted by a key-operated shutter that permitted the formation of the dots and dashes of the Morse code. Because consistency and regularity of sunshine were important, the heliograph was never widely adopted throughout the armies of continental Europe. This military use was not extensive, and it made little material contribution to the development of voice telephony.Where climatic conditions were favourable this instrument found much use, notably by the British army in India and the U. The invention of the telephone in 1876 was not followed immediately by its adoption and adaptation for military use. Before the outbreak of World War I, military adaptation of the telephone did take place, but its period of growth had not yet arrived.Before the end of the 18th century European armies used the visual telegraph system devised by towers or poles with movable arms.The Prussian army in 1833 assigned such visual telegraph duties to engineer troops.

The major powers throughout the world were quick to see the wonderful possibilities for military and naval signaling.The main arteries running from the rear to the forward trenches were crossed by lateral cable routes roughly parallel to the front.Thus, there grew an immense gridwork of deep buried cables, particularly on the German side and in the British sectors of the Allied side, with underground junction boxes and test points every few hundred yards.Codes were developed in the 16th century that were based upon the number and position of signal flags or lights or on the number of cannon shots. In his successful demonstration of electric communication between Washington, D.In the 17th century the British admiral and others developed regular codes for naval communication; and toward the close of the 18th century, Admiral Richard Kempenfelt developed a plan of flag signaling similar to that now in use. C., and Baltimore in 1844, he provided a completely new means of rapid signal communication.

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