Ferris, Richard. [from old catalog] · New York, T. Nelson and sons · leaf 458
r, Wheel—A wheel mounted on anupright pivoted shaft placed forward of its axle. EXPLANATION OF AERONAUTICAL TERMS. 457 # so that it swivels automatically to assume the lineof travel of an aeroplane when landing: used inthe alighting gear. To be distinguished from afixed wheel^ which does not… … The first Santos-Dumont biplane, constructed of cells. Centre of Gravity—That point of a body where itsweight centres. If this point is supported, thebody rests in exact balance. Centre of Lift—The one point at which the liftingforces of the flying planes might be concentrated,and produce the same…
Aeronautics
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