. Animal locomotion or walking, swimming, and flying : with a dissertation on aëronautics. p anddown for the purpose of causing the machine to ascend ordescend. Beneath the tail is a rudder for directing thecourse of the machine to the right or to the left; and tofacilitate the steering* a sail is stretched between two mastswhich rise from the car. The amount of canvas or oiled silknecessary for buoying up the machine is stated to be equalto one square foot for each half pound of weight. AERONAUTICS. 213 Wenham1 has advocated the employment of superimposed. with a view to augmenting the suppor
. Animal locomotion or walking, swimming, and flying : with a dissertation on aëronautics. p anddown for the purpose of causing the machine to ascend ordescend. Beneath the tail is a rudder for directing thecourse of the machine to the right or to the left; and tofacilitate the steering* a sail is stretched between two mastswhich rise from the car. The amount of canvas or oiled silknecessary for buoying up the machine is stated to be equalto one square foot for each half pound of weight. AERONAUTICS. 213 Wenham1 has advocated the employment of superimposed. with a view to augmenting the support furnishedwhile it diminishes the horizontal space occupied by theplanes. These planes Wenham designates Aeroplanes. Theyare inclined at a very slight angle to the horizon, and arewedged forward either by the weight to be elevated or by theemployment of vertical screws. Wenhama plan was adoptedby Stringfellow in a model which he exhibited at the Aero-nautical Societys Exhibition, held at the Crystal Palace inthe summer of 18Gx. The subjoined woodcut (fig. 110), taken from a photograph. Fig. 110.—Mr. Stringfellows Flying Machine. of Mr. Stringfellows model, gives a very good idea of thearrangement: a b c representing the superimposed planes, dthe tail, and e f the vertical screw propellers. The superimposed planes (a b c) in this machine containeda sustaining area of twenty-eight square feet in addition tothe tail (d). Its engine represented a third of a horse power, and theweight of the whole (engine, boiler, water, fuel, superimposedplanes, and propellers) was under 12 lbs. Its sustainingarea, if that of the tail (d) be included, was something likethirty-six square feet, three square feet for every pound—the sustaining area of the gannet, it will be remembered(p. 134), being less than one square foot of wing for everytwo pounds of body. 1 Atrial Locomotion, by F. H. Wenham.— World of Science, June 1S67. 2 1 4 AERONAUTICS. The model was forced by its propellers alo
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