In the pilot’s right hand is another lever; this combines two actions in an ingenious way. It actuates not only the rear-rudder of the machine, but also the wing-warping for the control of sideway balance. How the one rod combines these operations is shown by Fig. 36. Here, looking from behind, one sees the lever which the aviator holds. Towards the lower end is a rod projecting rearwards, and this is coupled to the extremity of another rod set at right angles to it, and pivoted in its centre; while from this pivoted rod run the wires which operate the rudder-planes. If the pilot swings his hand-lever either forward or backward, it moves to and fro the rod which is connected with it, and this imparts a forward or backward movement to the pivoted rod, with the result that one or other of the rudder wires is drawn forward--thus turning the rudder-planes from side to side. The hand-lever is free also to move from side to side; and if it is so moved it will draw with it the swinging rod which projects from the end of it--below that operating the rudders--and to the upright section of which the wing-warping wires are fixed. A movement either side upon the hand-level will pull over the wing-warping wires, therefore, and bring the flexible plane-ends into operation. Thus the dual movement of the lever is obtained--forward and backward for the rudder, from side to side for the warp. [Illustration: FIG. 36.--Rudder and wing-warp control (Wright Biplane). A. Controlling handle; B. Pivoted rod carrying wires to rudder; C.C. Rudder wires; D. Sideway swinging rod carrying wing-warp wires; E.E. Wing-warp wires.] The Wrights did not use their feet in any controlling movement, although in practically all modern aeroplanes, as will be explained later, the airman’s feet are utilized for pushing upon a bar and operating the rudder of the machine; but the Wrights preferred to make all actions with their hands. [Illustration: FIG. 37.--Wright Launching Rail. A. Biplane; B. Rail; C. Rope passing from the aeroplane round the pulley-wheel (D.) and thence to the derrick (E.); (F.) Falling weight.]