Ergograph

This is  called  hand  dynamometer  and  is  used  to induce  fatigue  to  the  hand  by  pulling  the lever for specified amount of time.

This is  an  electrical  wooden  box  with  a  metal  head  which has  a  box  with  a  metal  plate  having  nine  holes  of  varying sizes.  This  plate  is  electrically  connected  to  a  reset  type impulse    A  stylus  is  provided  to  insert  into  these holes  in  the  meta  l  plate.  The metal plate is electrically connected to a reset type impulse counter. When the stylus is inserted into the holes in the metal plate by the subject the errors will be automatically recorded whenever he touches the edges of the hole.