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