Ferris, Richard. [from old catalog] · New York, T. Nelson and sons · leaf 148
w 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 hour for upward of 2 hours. Another form of helicopter is the Leger machine,so… … 148 FLYING MACHINES: OTHER FORMS. clined after the machine is in the air in the directionin which it is desired to travel. The gyropter differs from the Cornu type of heli-copter in degree rather than in kind. In the Scotchmachine, known as the Davidson gyropter, the pro-pellers have the form of…
Aeronautics
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