Pipe to soil potential measurements may be made without penetrating the pavement and without trailing wires between the point of connection to the pipe and {HEAD ~ the available point} of {TAIL ~ connection} between the reference electrode and the soil 
Pipe to soil potential measurements may be made without penetrating the pavement and without trailing wires between the point of connection to the pipe and { HEAD ~ the available point } of { TAIL ~ connection } between the reference electrode and the soil
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 HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH