decrease the variation of speed
to control
to control SN
all of the above
Hartung governor
Wilson Hartnell governor
Pickering governor
Inertia governor
ball bearing
roller bearing
needle roller bearing
thrust bearing
in increasing velocity ratio
in decreasing the slip of the belt
for automatic adjustment of belt position so that belt runs centrally
increase belt and pulley life
for changing the direction of motion of the belt
for applying tension
for increasing -velocity ratio
