. The Street railway journal . y electrolysis or ordinary corrosion, in equity,it should not be assumed that all rust or pitting (where thepipe is positive to the rail) is caused by electrolysis; forthis is throwing, by an unwarranted assumption, on the rail-way companies the burden of maintaining the water pipesystems, which are positive to and paralleling their tracks,against natural depreciation. The investigations carried on by water companies are inseme cases placed in charge of electrolytic enthusiasts, whowill unfold tales of horrors that are going to happen by thewholesale destruction
. The Street railway journal . y electrolysis or ordinary corrosion, in equity,it should not be assumed that all rust or pitting (where thepipe is positive to the rail) is caused by electrolysis; forthis is throwing, by an unwarranted assumption, on the rail-way companies the burden of maintaining the water pipesystems, which are positive to and paralleling their tracks,against natural depreciation. The investigations carried on by water companies are inseme cases placed in charge of electrolytic enthusiasts, whowill unfold tales of horrors that are going to happen by thewholesale destruction of the water mains due to the silentbut inevitable action of the diverted railway return has happened periodically for the past seven years, butthe fear of danger has now nearly passed, except when ex-pressed in scare lines in the public press, for nothing seri-ous has yet happened that could be attributed, even by thewater companies involved, to electrolysis. Where the railway and water companies can mutually co-. FIG. 8.—CORRECT DIAGRAM OF CIRCUITS AT PEORIA apart, at this location, will show a difference in much more marked difference will be found when onerod is stuck in the ground and the other connected to thewater pipe, for then the water pipe acts as a pressure wireover a larger potential area. Tests made by Mr. Maury bymeasuring the potential between the standpipe bolt and the16-in. water main were not tests duplicating the conditionsthat existed before the collapse of the standpipe. If an officer of the water company wished to find the flowof water in a pipe, and sent out a man to determine it, andif the latter should report that there was 80 lbs. pressure, itwould not be rash to come to the conclusion that the manwas ignorant. Yet in the question of electrolysis potentialdifferences are given as a criterion of the electrolytic con-ditions existing, whereas the only thing that has any bear-ing on the subject is the current flow. As the effec
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