The lengths of the links comply with the condition: A͞D=D͞B=B͞E. Links 1 and 2 are connected together by turning pair A. Pin B slides along slot a-a of link 2; pin E along slot b-b of link 1. For an arbitrary position of link 1 with respect to link 2, angle DAB=α, angle EDB=2α and angle EBC=3α.
$1294$LG,MO$