The transmission ratio is set by defining {TAIL ~ a continuously variable pivoted position} of the intermediate roller between {HEAD ~ the input disk} and the output disk 
The transmission ratio is set by defining { TAIL ~ a continuously variable pivoted position } of the intermediate roller between { HEAD ~ the input disk } and the output disk
OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH