Stylus A, fixed on frame 1, is moved along curve f(x) which is plotted in a coordinate system having its origin at point 0. This motion along curve f (x) leads to motion of the who frame which can travel along axes x-x and y-y by means of guides not shown in the drawing. When stylus B is moved along curve H(x), plotted in a coordinate system with its origin at point 0', carriage 2 moves along the vertical guide of frame 1. At this, stylus 3, the tracing point of an attached planimeter, slides simultaneously in the slot of carriage 2 and in the slot of guide a which is secured rigidly to frame 1. Then the measuring wheel of the planimeter gives the value of a function expressed by the equation u=k∮(f(x)h{x))dx where k is the proportionality factor depending upon the dimensions of the planimeter.
$1307$LG,MO