Airships past and present, together with chapters on the use of balloons in connection with meteorology, photography and the carrier pigeon . reductions of maps published on a larger scale, are taken oncelluloid films, and mounted in position between thin sheets ofglass, two inches square. The lighting arrangement contains asmall electric glow-lamp and a battery, the lamp being switchedon and off as required. This arrangement works well on nightjourneys, and it is generally possible to determine the localityby noting the lights in the towns and the positions of therailways. The daylight appara
Airships past and present, together with chapters on the use of balloons in connection with meteorology, photography and the carrier pigeon . reductions of maps published on a larger scale, are taken oncelluloid films, and mounted in position between thin sheets ofglass, two inches square. The lighting arrangement contains asmall electric glow-lamp and a battery, the lamp being switchedon and off as required. This arrangement works well on nightjourneys, and it is generally possible to determine the localityby noting the lights in the towns and the positions of therailways. The daylight apparatus weighs 4 oz., the lighting-apparatus 5 oz., and the complete thing together with the caseweighs 13 oz. The price is twenty-five shillings, which mayeasily be saved in the cost of maps. It is extremely necessary to see that the whole of the materialis maintained in thoroughly sound condition. Everything must a. o 194 AIESHIPS PAST AND PEE SENT. be carefully examined before starting. With a free balloon, thisis particularly necessary, seeing that damage may have been doneat landing or by the ripping-cord. It is always emptied after a. Fig. 120.—Balloon basket and its contents. journey; the gas soon becomes adulterated by diffusion, and itisnot generally possible to anchor an inflated balloon. Sometimesa balloon can be loaded with ballast and left in its inflated con-
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Keywords: ., bookcentury1900, bookdecade1900, bookpubl, booksubjectaeronautics
