Ferris, Richard. [from old catalog] · New York, T. Nelson and sons · leaf 180
1,400 revolutions per minute, at which speedit exerts a pull of 242 lbs. Each wing of the main plane is built upon 2transverse spars extending outward from the upperbamboo pole, starting at a slight angle upward andbending downward nearly to the horizontal as theyapproach the outer extremities.… … 180 FLYING MACHINES: HOW TO BUILD. immersion in hot water, and straining them aroundblocks nailed to the floor of the workshop, in theform shown at QQ, p. 177. The front spar is set about 9 inches back from thefront edge of the plane, and the rear one about 12inches forward of the back edge of the…
Aeronautics
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