Here is a website with videos of straight line linkages: http://web.mat.bham.ac.uk/C.J.Sangwin/howroundcom/straightline/exact.html http://web.mat.bham.ac.uk/C.

Here is a website with videos of straight line linkages: http://web.mat.bham.ac.uk/C.J.Sangwin/howroundcom/straightline/exact.html http://web.mat.bham.ac.uk/C.J.Sangwin/howroundcom/straightli...