The presence of water at {HEAD ~ the distal ends} of {TAIL ~ probes} 33, 51 results in a ground potential applied to wires 38, 56, thereby causing activation of coils 34, 58 and closure respectively of the associated context 35, 36 and 59, 60 
The presence of water at { HEAD ~ the distal ends } of { TAIL ~ probes } 33 , 51 results in a ground potential applied to wires 38 , 56 , thereby causing activation of coils 34 , 58 and closure respectively of the associated context 35 , 36 and 59 , 60
OTH OTH OTH OTH OTH HEAD 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 OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH