{TAIL ~ The presence} of water at the distal ends of {HEAD ~ 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 
{ TAIL ~ The presence } of water at the distal ends of { HEAD ~ 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
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