The lengths of the links comply with the conditions: B͞D=C͞E and D͞E=B͞C. Thus figure BDEC is a parallelogram. When crank 1 rotates about fixed axis A, slider 3 reciprocates. If arbitrary ray Aa is drawn from point A, then points G and F, lying on the axes of links 2 and 4, will describe similar paths with a similarity factor k=A͞D/A͞B.
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