Traction curve, base on <a href="//commons.wikimedia.org/wiki/File:Traction_curve.png" title="File:Traction curve.png">this picture</a>
<a href="//commons.wikimedia.org/w/index.php?title=User:JMPerez&amp;action=edit&amp;redlink=1" class="new" title="User:JMPerez (page does not exist)">JMPerez</a>
2007-06-20
<span class="int-own-work" lang="en">Own work</span>