When tracing point A is moved along curve f(ϕ), link 1 with gear segment a turns about axis D of link 2. Segment a meshes with and moves rack 3 which carries slotted member b. Slider 4 moves along the slot of member b and is pivoted to lever 5 which turns about axis B of link 2. At the same time, links 1 and 2 and rack 3 are turned about pole O. The number of revolutions of the recording wheel, carried on lever 5, is proportional to the integral u=c∫(r-r₀)dϕ where c is the proportionality factor, and ϕ is the angle of rotation of rack 3.
$2503$LrG,MO$