When tracing point A is moved along curve a, carriage 1, rigidly attached to sun gear 3, travels along straight guides b-b, and planet gear 2 rolls around gear 3. Gear 2 is connected by a turning pair to link 4 which, in turn, is connected by turning pair B to carriage 1. Recording wheel 5, whose axis is rigidly attached to gear 2, rotates an amount proportional to the required integral ϕ=c∮(y²)dx, where c is a constant.
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