This method of mounting the wheels of the chassis has been found the most satisfactory. The spring takes up the shock of a sudden landing and the pivot working in the hollow post allows the entire mounting to swing like a caster, and adapt itself to any direction at which the machine may strike the ground.] The wheels are of the bicycle type, with wire spokes, but with hubs six inches long. The axle is bent to incline upward at the ends, so that the wheels incline outward at the ground, the better to take the shock of a sideways thrust when landing. The usual metal or wood rims may be used, but special tires of exceptionally light construction, made for aeroplanes, should be purchased. The controlling wires or cords for moving the rudder (or tail) and for warping the tips of the wings are of flexible wire cable, such as is made for use as steering rope on small boats. The cable controlling the horizontal plane of the rudder-tail is fastened to a lever at the right hand of the operator. The cable governing the vertical plane of the rudder-tail is attached to a wheel at the left hand of the operator. The cables which warp the tips of the wings are fastened to a lever which projects upward just back of the operator’s seat, and which is slipped into a long pocket sewed to the back of his coat, so that the swaying of his body in response to the fling of the tipping machine tends to restore it to an even keel. Springs are attached to all of these controlling wires, strong enough to bring them back to a normal position when the operator removes his hands from the steering apparatus. The brass sockets used in connecting the tubular struts to the main bamboos and the rudder-post, and in fastening the axle of the wheels to the lower bamboos and elsewhere, should be thoroughly made and brazed by a good mechanic, for no one should risk the chance of a faulty joint at a critical spot, when an accident may mean the loss of life. [Illustration: Diagram of Bleriot monoplane showing sizes of parts, in metres. Reduced to feet and inches these measurements are: 0.60 metres 1 ft. 11½ in. 1.50 metres 4 ft. 11 in. 2.10 metres 6 ft. 10½ in. 3.50 metres 11 ft. 6 in. 8.00 metres 26 ft. 3 in. 8.60 metres 28 ft. 2½ in. The diagram being drawn to scale other dimensions may be found. In both the plan (upper figure) and elevation (lower figure), _A_, _A_, is the main plane; _B_, tail plane; _C_, body; _D_, elevator wing-tips; _E_, rudder; _a_, _a_, rigid spar; _b_, _b_, flexible spar; _r_, _r_, points of attachment for warping-wires; _h_, _h_, guys; _H_, propeller; _M_, motor; _R_, radiator; _S_, pilot’s seat; _P_, chassis.] For the rest, it has seemed better to put the details of construction on the plans themselves, where they will be available to the aeroplane builder without the trouble of continually consulting the text.