For example, an output signal corresponding to, optionally proportional to, {HEAD ~ the extent} of {TAIL ~ rotary adjustment} can be generated as a regulating function 
For example , an output signal corresponding to , optionally proportional to , { HEAD ~ the extent } of { TAIL ~ rotary adjustment } can be generated as a regulating function
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH