When tracing point A is moved along curve a, carriage 1, rigidly attached to gear 2, has translational motion along axis x-x. Tracing arm 3 is connected by turning pair D to carriage 1 and serves as a carrier for internal gear 4 which turns about axis B. Gear 4 meshes with gear 2 and is rigidly attached to the axis of recording wheel 5 which is rotated when gear 4 rotates. The rotation of wheel 5 is proportional to the required integral, i.e. ϕ=c(∫(sqrt(y))dx); with limits [x₁,x₂], where c is a constant.
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