Construct the Peaucellier's linkage. 

Construct a linkage to draw the ellipse. 

Construct a linkage to draw the lemniscate as thus: 

Construct another linkage to draw the lemniscate as thus: 

Construct a linkage to draw the cardioid as thus: 

Construct a linkage to draw the nephroid 

Construct a linkage to draw the deltoid. 

Construct a linkage to draw the astroid. 
