, and especially if box, A B C, containing both the transmitter and re- very practical, have been proposed at different epochs, 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 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 Convention that the city of Conde enemy’s lines, and at…
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