A description is given of a system used to make potential measurements in stray current areas between an underground structure and the negative bus of a railway substation. The system involved the use of two varistors with a conventional DC meter. One varistor was placed in series with the meter to block the negative potentials. The other was placed in the reverse direction across the meter to by-pass any leakage current of the first varistor. The use of four varistors with a meter is also described. 2.4.2

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Copyright 1959 by the National Association of Corrosion Engineers.
1959
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