The lengths of the links comply with the conditions: B͞C=A͞B, B͞F=E͞D and B͞E=F͞D. Links 1, 2 and 5 form an ellipsograph. Any point of link 2 describes an ellipse. Links 1, 2, 3 and 4 form a pantograph. Therefore, point D describes an ellipse similar to the one described by point G of link 2, the similarity factor being k=A͞F/A͞B.
$1604$SC,Ge$