Airships past and present, together with chapters on the use of balloons in connection with meteorology, photography and the carrier pigeon . of the ropes were crossedin the space between the car and the body, whereas the others were taken direct to the sides of thecar, which was built in the shape of a boat. It carried 14 men,who worked the propeller, and also attended to the pumps usedin connection with the air-bags. It is hardly necessary to giveany further description of this scheme, seeing that it constitutesnothing of the nature of an advance on its predecessors. In the meantime, Paul Ha
Airships past and present, together with chapters on the use of balloons in connection with meteorology, photography and the carrier pigeon . of the ropes were crossedin the space between the car and the body, whereas the others were taken direct to the sides of thecar, which was built in the shape of a boat. It carried 14 men,who worked the propeller, and also attended to the pumps usedin connection with the air-bags. It is hardly necessary to giveany further description of this scheme, seeing that it constitutesnothing of the nature of an advance on its predecessors. In the meantime, Paul Haenlein (who died in 1895) constructedan airship in Germany. Its shape was that of a solid formed bythe revolution of a ships keel about an axis lying on the hydrostatic experiments led him to the choice of thiscurious shape, which in the middle is more or less cylindrical,and at the ends somewhat conical. Its length was 164 ft., thegreatest diameter 30 ft., and the capacity 85,000 cubic feet. Thecar was placed close to the body, in order that the parts mightbe as rigidly connected as possible. For the first time in the e 2. 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
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