The microprocessor supplies a nominal voltage to an analog output, {HEAD ~ this nominal voltage} allowing {TAIL ~ an automatic transducing} with any X Y recorder 
allowing
The microprocessor supplies a nominal voltage to an analog output , { HEAD ~ this nominal voltage } allowing { TAIL ~ an automatic transducing } with any X Y recorder
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH