The lengths of the links comply with the condition: A͞C:A͞B=C͞D:B͞E. Link 1 and sliding link 2 turn about fixed axis A. Links 4 and 5 are connected by turning pairs C and B to link 1, and by turning pairs D and E to sliders 6 and 3 which move along axis Ax of sliding link 2. When link 1 turns about axis A, selected as the centre of similarity, and one of the points D or E travels along any arbitrary path, the other point describes a similar path. The mechanism has reversibility since any point, A, D or E, can be selected as the centre of similarity.
$1446$LG,P$