When the force acting on flat spring 1 is increased, lever 2 is
turned clockwise by p in 3. Segment gear a at the bottom end of
lever 2 meshes w ith p inion 4 on whose shaft slider 5 of rheostat 6
is rig id ly mounted. Lever 2 is held against pin 3 by spring 7.
Spring 8 and strap 9, running over roller 10, elim inate backlash
between segment gear a and p inion 4. R oller 10 is rig id ly
mounted on the shaft of p inion 4. The resistance of rheostat 6
depends upon the deflection of spring 1 and, consequently, on
the force applied to this spring.
$4380$SmE,M$