alling is quite distinct from wiireless telegraphy. Signalling is performed by means of flags, horns or lights, which are caused to produce the same symbols or char- acters to be read by ear or eye from a long distance. :^ ^^' ^^* Jifg: a^^^^^^^Sr^j^fof^y^^^^P^^^^^ ^^1 iiJMli^^^^m 1 P IMilitary… … and kites are used after the manner shown in Figs. 5. 6. and 7. American and European armies have used Signaling from a IMilitary Balloon. balloons for some years, and they were notably
Aeronautics
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