Airships past and present, together with chapters on the use of balloons in connection with meteorology, photography and the carrier pigeon . aidof the most perfect mechanism,a man will be able by his ownmuscular exertion to raise hisbody into the air and to main-tain it in that position. But Borelli gave a very clearexposition of the law of Archi-medes, and considered in conse-quence that an imitation of theflight of birds was the other hand he thoughtthat the bladder of a fish was amore hopeful suggestion, buthe strongly opposed all schemeswhich necessitated the creation of
Airships past and present, together with chapters on the use of balloons in connection with meteorology, photography and the carrier pigeon . aidof the most perfect mechanism,a man will be able by his ownmuscular exertion to raise hisbody into the air and to main-tain it in that position. But Borelli gave a very clearexposition of the law of Archi-medes, and considered in conse-quence that an imitation of theflight of birds was the other hand he thoughtthat the bladder of a fish was amore hopeful suggestion, buthe strongly opposed all schemeswhich necessitated the creation of a vacuum. In view of theexternal pressure of the atmosphere, any vacuum apparatuswould have to be constructed of metal and must be of greatsize. Its consequent weight made the whole thing impossible,and arguments of this nature might well be considered by someof the inventors who are still at work on the problem. Hisconclusions, which were at once thoughtful and clearly expressed,came into the hands of many scientific men and interested themin. the possibility of a solution. The science of aeronautics may be divided into two parts, of. Fig. 3, -The flying ship, designed by-Francisco de Lana. THE EAELY HISTORY OF THE ART. 5 which the one may be called aerostatics, and the otheraerodynamics. Aerostatical devices include those in which theload is lifted by filling certain spaces with a gas which is lighterthan air, whereas in aerodynamical machines the effect is pro-duced by means of propellers or other arrangements of a similarkind, tending to cause motion through the air. Bartholomaus
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Keywords: ., bookcentury1900, bookdecade1900, bookpubl, booksubjectaeronautics
