ed, and especially if very practical, have been proposed at different epochs, box, ABC, containing both the transmitter and re- their use had been better known, men certainly would ceiver. The latter consists simply of a telescope, R, but have not been adopted, for the most part because have been… … The first dispatch was sent making the box shorter; but Fig. 2.-MILITARY OPTICAL TELEGRAPH WITHOUT HELI0STAT September" 1, 1794, from Lille this in no wise changes the principle of the system. The to Paris in a few hours. It luminous source is placed in the focus thus obtained. announced to the…
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