A vacuum device 38 may be used to vacuum the particulate matter from {HEAD ~ the outer surface} of rotary screen 36 as the screen rotates past {TAIL ~ the vacuum} 
A vacuum device 38 may be used to vacuum the particulate matter from { HEAD ~ the outer surface } of rotary screen 36 as the screen rotates past { TAIL ~ the vacuum }
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL