Ferris, Richard. [from old catalog] · New York, T. Nelson and sons · leaf 221
hanism that which is impossible to hissentient determination. Even if the nervous system could be schooled into 220 MODEL FLYING MACHINES, endurance of the wear and tear of consciously bal-ancing an aeroplane for many hours, it is still im-perative that the task be not left to the exertion ofhuman… … Diagram showing smoothly flowing air currents caused by correctly shapedplane at proper angle of incidence. volving slowly, or small screws revolving rapidly,are the more effective; how many blades a propellershould have, and their most effective shape; what isthe perfect material for the planes…
Aeronautics
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