A hopper 30 is fixed to the casing 10 with its opening at {HEAD ~ the bottom} directed to the top end of the gap A between the stator 16 and {TAIL ~ the rotor} 11 
A hopper 30 is fixed to the casing 10 with its opening at { HEAD ~ the bottom } directed to the top end of the gap A between the stator 16 and { TAIL ~ the rotor } 11
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL OTH