The lengths of the links of four-bar linkage ABCD comply with the conditions: A͞B=D͞C, B͞C=2.5A͞B and B͞E=C͞E=2.25A͞B. When link 1 turns about fixed axis A, point E of link 2 describes a path of which a certain portion approximates straight line q-q, parallel to AD.
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