<p>An animated depiction of a <a href="https://en.wikipedia.org/wiki/en:Chebyshev_linkage" class="extiw" title="w:en:Chebyshev linkage">w:en:Chebyshev linkage</a> (converts rotational motion to approximate straight-line motion)<br>
Link ratios are: L1 : L2 : L3 = 2 : 2.5 : 1. Point P is in the middle of L3<br></p>
In this example: L1=4, L2=5, L3=2, L4= 5, P= in the middle of L3
<a href="//commons.wikimedia.org/w/index.php?title=User:Van_helsing&amp;action=edit&amp;redlink=1" class="new" title="User:Van helsing (page does not exist)">Van helsing</a>
CC BY 2.5
self-made largely based on <a rel="nofollow" class="external text" href="http://historical.library.cornell.edu/cgi-bin/cul.math/docviewer?did=Kemp009&amp;view=50&amp;frames=0&amp;seq=21"><i>"How to draw a straight line, by A.B. Kempe, B.A."</i></a>, <a rel="nofollow" class="external autonumber" href="http://www.softintegration.com/chhtml/toolkit/mechanism/fourbar/fourbarChebyshev.html">[1]</a> and <a rel="nofollow" class="external autonumber" href="http://kmoddl.library.cornell.edu/model.php?m=140">[2]</a>