Airships past and present, together with chapters on the use of balloons in connection with meteorology, photography and the carrier pigeon . night is a very rare occurrence; andit is nearly always possible to send up a string of kites to a heightof a few hundred feet. Signalling can therefore easily be carriedout, either by hoisting flags in the daytime, or lights at regard to lights, the simplest plan is to use different colours,and to vary their position with regard to one another. Bengallights of different colours could also be used to convey intelligence. KITES. 121 Doubtless t
Airships past and present, together with chapters on the use of balloons in connection with meteorology, photography and the carrier pigeon . night is a very rare occurrence; andit is nearly always possible to send up a string of kites to a heightof a few hundred feet. Signalling can therefore easily be carriedout, either by hoisting flags in the daytime, or lights at regard to lights, the simplest plan is to use different colours,and to vary their position with regard to one another. Bengallights of different colours could also be used to convey intelligence. KITES. 121 Doubtless the best thing in this respect is the electric light, whichcan be switched on and off from below. If electric lights arearranged, one above the other in separate compartments, andshaded by glasses of different colours, a message can be Morse code could always be used by showing the lights forlonger and shorter intervals. Tests have shown that the electriclight is clearly visible over a distance of 12 miles, so that signalsof this type would be useful over that range. Attempts have been made in America as well as in England.
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