Carriage 1 travels along axis x-x. When tracing point A is moved along curve y=f(z), slider 2 moves along a guide of carriage 1. The movement of slider 2 is transmitted through flexible link 3 and slider 4 to t racing point D which gives the differential (dz/dx)=f(z). Slotted guide link 5 turns about point D and simultaneously slides along block 6 which is pivoted to carriage 1 at point B. The motion of link 5 is transmitted through sleeve 7 and parallelogram linkwork EKFN to wheel 8 with a sharp-edged rim, the plane of the wheel being always parallel to link 5. Wheel 8 is set so that the angle φ between its plane and axis x-x is such that tan(φ)=dz/dx=f(z). By means of friction, wheel 8 moves table 9, resting on the wheel , on which the curve y=f(z) is drawn. At this, tracing point M, secured to table 9, describes the curve z=∫(f(z))dx.
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