The diagram to explain the capstan equation.
Translated into Telugu by <a href="//commons.wikimedia.org/wiki/User:Mekala_Harika" title="User:Mekala Harika">User:Mekala Harika</a>
Own work by <a href="//commons.wikimedia.org/wiki/User:Krishnavedala" title="User:Krishnavedala">User:Krishnavedala</a>