The servo amplifier 188 also receives {HEAD ~ a signal} on line 192 from a change detector 194 which will initially be at the 3 volt level, i.e. the signal level representing {TAIL ~ the desired workpiece dimension} 
The servo amplifier 188 also receives { HEAD ~ a signal } on line 192 from a change detector 194 which will initially be at the 3 volt level , i.e. the signal level representing { TAIL ~ the desired workpiece dimension }
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 OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL