Airships past and present, together with chapters on the use of balloons in connection with meteorology, photography and the carrier pigeon . tionwith scientific work. The observa-tory contained a carpenters shopfor making kites, a balloon shed,a house from which the wincheswere worked, with a tower 90 , and also the necessary work-ing and living rooms. Assmannsaw that kites would not beFig. 159.—Dr. Hergeseii. sufficient for the carrying out of his plans; he intended to take observations at great heightsevery morning for several hours, and therefore ordered a kite-balloon, which was to
Airships past and present, together with chapters on the use of balloons in connection with meteorology, photography and the carrier pigeon . tionwith scientific work. The observa-tory contained a carpenters shopfor making kites, a balloon shed,a house from which the wincheswere worked, with a tower 90 , and also the necessary work-ing and living rooms. Assmannsaw that kites would not beFig. 159.—Dr. Hergeseii. sufficient for the carrying out of his plans; he intended to take observations at great heightsevery morning for several hours, and therefore ordered a kite-balloon, which was to be used when the velocity of the wind wasless than 18 or ^0 ft. per second, a speed insufficient for the flyingof kites. Ordinarily either kites or the kite-balloon are used;but on international days free balloons are sent up, eitherwith or without observers. The latter are used in a specialmanner that has been gradually evolved as the result ofexperience. The use of balloons without observers but carrying recordinginstruments was the idea of Hermite and Besancon, and thedetails were carefully elaborated by Teisserenc de Bort in his. SCIENTIFIC BALLOONING. 257 Observatoire cle la Meteorologie dynamique. Balloons areused, made of the lightest silk, cambric or paper, varnished withrubber solution or linseed oil; their capacities vary from 1,000to 17,500 cubic feet. The weight of the instruments is verysmall, and therefore the size of the balloon depends generallyon the height to which it is proposed to ascend. The net is of
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Keywords: ., bookcentury1900, bookdecade1900, bookpubl, booksubjectaeronautics
