That is, the lever 74 must have a total increment of {HEAD ~ 156 degrees} of {TAIL ~ rotation} or oscillation to produce one degree of turning of the intermediate member 28, and hence of the shaft 60 
of
That is , the lever 74 must have a total increment of { HEAD ~ 156 degrees } of { TAIL ~ rotation } or oscillation to produce one degree of turning of the intermediate member 28 , and hence of the shaft 60
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH