When stylus A follows curve r=f(ϕ), link 1 turns about fixed axis D. Slider 2 moves along guiding link 1. Slidinging link 3 is connected by turning pair B to slider 5 and by a sliding pair to slider 4. Sliders 2 an 4 are connected together by turning pair A. Slider 5 moves alongd guide d. Circular guides a are rigidly secured to slider 5 an they move together. Stiylus C on slider 7 describes the integral curve with the equation R=∫r dϕ. Sharp-edged wheel 6, perpendicular to sliding link 3, restricts axial motion of link 3.
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