C. J. Sangwin’s linkage movies
Chris Sangwin has a nice collection of linkage movies on his web-site http://www.howround.com. Particularly nice are the straight line mechanisms found at the link:
http://web.mat.bham.ac.uk/C.J.Sangwin/howroundcom/straightline/exact.html
His example of the Sarrus linkage is also found on YouTube:
