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The better vision of those days made it possible to catch asignal, though far off, and to transmit it to some other station, likewise far away. In this manner bright objects were waved by day andtorches by night. In times of invasion such a method of spreadinginformation has been used down to the present age. Nor may we fail tonote the improved apparatus for this kind of signaling now employed inmilitary operations. The soldiers on our frontiers in Arizona, NewMexico, and through the mountainou...s regions further north, are able tosignal with a true telegraphic language to stations nearly a hundredmiles away. Considerable progress was made in telegraphy in the after part of theeighteenth century. This progress related to the transmission ofvisible messages through the air. In the time of the French Revolutionsuch contrivance occupied the attention of military commanders and ofgoverning powers. A certain noted engineer named Chappe invented atthis epoch a telegraph that might be properly called successful.
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