. Electric railway journal . rs in St. Louis As a Sequel to Their Discussion of the General Subject the Authors Present the Results of a Test on a Rail-way Installation for Electrolysis Mitigation Made by the Bureau of Standards Under Their Direction BY E. B. ROSA, BURTON MCOLLUM AND K. H. LOGAN In connection with the general investigations of elec-trolysis that have been carried out by the Bureau ofStandards for the past two or three years a considerableamount of preliminary work was done during the sum-mer of 1912 in the city of St. Louis. As a result of thiswork an arrangement was made with
. Electric railway journal . rs in St. Louis As a Sequel to Their Discussion of the General Subject the Authors Present the Results of a Test on a Rail-way Installation for Electrolysis Mitigation Made by the Bureau of Standards Under Their Direction BY E. B. ROSA, BURTON MCOLLUM AND K. H. LOGAN In connection with the general investigations of elec-trolysis that have been carried out by the Bureau ofStandards for the past two or three years a considerableamount of preliminary work was done during the sum-mer of 1912 in the city of St. Louis. As a result of thiswork an arrangement was made with the United Rail-ways of St. Louis for the carrying out of a test at one ofthe substations for the purpose of demonstrating theeffectiveness of the insulated return feeder system, thework of installing the negative feeders being done bythe United Railways Company. The purpose of the test was twofold—first, to demon-strate the effectiveness of the insulated return feedersystem as a means of mitigating electrolysis troubles,. Electric Ry. Journal Fig. 1—Electrolysis Test—Original Arrangement of Unin-sulated Negative Feeders and, second, to determine the relative cost of securinggood conditions from the standpoint of electrolysis ascompared with the cost of securing the same conditionsunder the ordinary methods with uninsulated negativefeeders. Therefore it was necessary to carry on thetests under two conditions, namely, to install a system ofnegative feeders complete, and in such a way that theycould be converted into the insulated or uninsulatedfeeder systems at will. This could readily be accom-plished by simply tying the busbar to the tracks nearthe power house for the uninsulated system and remov-ing such ties and inserting suitable resistance taps forthe insulated system. It is true that in both cases thefeeders themselves were insulated from the tracks be-tween the point at which they were tied into the tracksand the busbar, but since the feeders were at the samepoten
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