Airships past and present, together with chapters on the use of balloons in connection with meteorology, photography and the carrier pigeon . Fig. 2i.—Dupuy de Lomesballoon, 1872. 52 AIESHIPS PAST AND PEESENT. history of aeronautics it was proposed to use a gas engine, whichwas of the Lenoir type, and had four horizontal cylinders, giving6 , with an hourly consumption of 250 cubic feet of gas. Thegas for the engine was taken from the balloon itself, and theloss was to be made good by blowing out the air-bags. The carwas made of beams running lengthwise, and was supportedtangentially by ro
Airships past and present, together with chapters on the use of balloons in connection with meteorology, photography and the carrier pigeon . Fig. 2i.—Dupuy de Lomesballoon, 1872. 52 AIESHIPS PAST AND PEESENT. history of aeronautics it was proposed to use a gas engine, whichwas of the Lenoir type, and had four horizontal cylinders, giving6 , with an hourly consumption of 250 cubic feet of gas. Thegas for the engine was taken from the balloon itself, and theloss was to be made good by blowing out the air-bags. The carwas made of beams running lengthwise, and was supportedtangentially by ropes from the network. The envelope wasmade airtight by a thick coating of rubber on the inside, backedby a thinner one on the outside. Being filled with coal gas it. Fig-. 25.—Paul Haenleins dirigible balloon. could not ascend to great heights, and the trials were thereforeundertaken at a short distance from the ground, the balloonbeing kept in the captive state by ropes loosely held by attained a speed of 15 ft. per second, and this is an improve-ment of 6 ft. per second on the attempts of Dupuy de of funds prevented any further attempts from being made,and though the project promised well and had some notableimprovements, it was unable to proceed further. If Haenleinsresults are compared with those of Lebaudy, who has reached aspeed of 40 ft. per second, we can hardly doubt he would haveachieved more if he had filled his balloon with hydrogen, and iflight motors, of the type now in use, had then been available. CHAPTEE VII. DIRIGIBLE BALLOONS FROM 1883 TO 1897. Ten years later the brothers Gaston and Albert Tissandierproduced a remarkable airship. During the Franco-Prussian war,Gaston Tissandier made many unsuccessful att
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