Ferris, Richard. [from old catalog] · New York, T. Nelson and sons · leaf 93
elevator is there, but raised nearly to thelevel of the upper plane, and placed 9 feet from thefront edge of the main planes. To control the equi-librium, the two back corners of each plane are cutand hinged so that they hang vertically when not inflight. When in motion these flaps or… … FLYING MACHINES: THE BIPLANE. 93 in very nnicli the same manner as the warping tipsof the Wright machine. A pair of tail planes are setin parallel on a framework about 20 feet in the rearof the main planes, and a double rudder surface be-hind them. Another model has hinged ailerons onthese tail…
Aeronautics
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