Ferris, Richard. [from old catalog] · New York, T. Nelson and sons · leaf 147
entire weight. Withan 8-cylinder Antoinette motor, said to be but 24horse-power, turning two 20-foot propellers, the ma- 146 FLYING MACHINES: OTHER FORMS. cliine is reported as lifting itself and two persons—a total weight of 723 pounds—to a height of 5feet, and sustaining itself for 1 minute. Upon… … Diagram showing principle of the Cornu hehcopter. P, P, propelHng planes.The arrow shows direction of travel with planes at angle shown. Wright machine, which, with a 25 to 30 horse-powermotor operating two 8-foot propellers, raises a weightof 1,050 pounds and propels it at a speed of 40 milesan…
Aeronautics
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![An illustration from Essai de physique, par Mr. Pierre van Musschenbroek ... avec une description de nouvelles sortes de machines pneumatiques, et un recueil d'expériences par Mr. J. v[an] M[usschenbroek] Traduit du hollandois par Mr. Pierre Massuet .. (1751)](https://img.insideoutlibrary.com/img/200/ia-essaidephysiquep02muss-70-13.webp)
