Airships past and present, together with chapters on the use of balloons in connection with meteorology, photography and the carrier pigeon . 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-. Fig. 121.—Vollbehrs microphotoscope for reading maps on a reducedscale, together with, illuminating device for night work. dition during the night, if the weather is very fine ; then on thenext day it is possible to cont
Airships past and present, together with chapters on the use of balloons in connection with meteorology, photography and the carrier pigeon . 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-. Fig. 121.—Vollbehrs microphotoscope for reading maps on a reducedscale, together with, illuminating device for night work. dition during the night, if the weather is very fine ; then on thenext day it is possible to continue the journey with a smallernumber of passengers than before. Things are somewhatdifferent with a captive balloon, which is often left in the inflated INSTRUMENTS. 195 state for several days, in order to save expense; when at last itno longer has sufficient lift, it is emptied and refilled. Lebaudysmotor-balloon worked for several months with one filling of it is emptied, the gas is simply passed into the air, and isuseless for apy further purpose. In Germany, a balloon is emptiedby means of the ripping-cord ; in other countries, a usual method
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