Airships past and present, together with chapters on the use of balloons in connection with meteorology, photography and the carrier pigeon . ter of 20 ft., and producemotion in a vertical direc-tion ; the propeller D. hasa diameter of 6J ft., anddrives the machine for-wards. Each of the propellers C has a total surface of 43 squarefeet, and together with the transmission gear it weighs 30 lbs. Theone revolves in the opposite direction to the other, so as to preventa rotation of the entire apparatus about a vertical axis. The caris constructed of bamboo, and contains a Levavasseur motor withei
Airships past and present, together with chapters on the use of balloons in connection with meteorology, photography and the carrier pigeon . ter of 20 ft., and producemotion in a vertical direc-tion ; the propeller D. hasa diameter of 6J ft., anddrives the machine for-wards. Each of the propellers C has a total surface of 43 squarefeet, and together with the transmission gear it weighs 30 lbs. Theone revolves in the opposite direction to the other, so as to preventa rotation of the entire apparatus about a vertical axis. The caris constructed of bamboo, and contains a Levavasseur motor witheight cylinders, giving 28 horse-power. The weight of this motortogether with the necessary supply of water is 1 cwt. At the backof the drivers stand is placed a vertical rudder. The preliminarytrials are said to have been successful and each of the lifting pro-pellers was found to be able to raise a weight of 200 lbs.; the totallift was therefore 400 lbs., and this could raise the machine and 1 See also Proceedings of the International Conference on Aerial Navigation atChicago, 1903, p. 284 ; and Lecornu, La Navigation Aerienne, p. Fig. 49.—Dufaux flying machine withpropellers. FLYING MACHINES. 95 driver, besides about 30 lbs. of cargo. He used no sails, andthis would add greatly to the danger of an accident caused bystoppage of the motor. In such a case he would scarcely get offso easily as he has done in the past. No doubt this fact weighedon his mind, for he proceeded forthwith to build himself a kite,intending to drive it by propellers placed at the sides of thesails. The rudder is in the shape of a cross, and capable ofbeing turned about both horizontal and vertical axes. The sailsare of silk, stretched over bamboo, and are 50 ft. long and 26 , with an area of 237 square feet; the weight of the wholemachine together with the driver is only 310 lbs. He hasalready made two ascents in this airship. On the first attempt,it rose in the air, but after a shortdista
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