. Electric railway gazette . probably was deflectedsomewhat out of the plane of the wheel by striking atruss. Two pieces went through the boiler room wall but causedno more serious damage than deranging the piping. Whileone went completely through the boiler room, several pieceswere found on the northern side, which must have gonethrough the roof. One of these, weighing a ton, landedin an old canal boat, 330 feet away from the engine room. Immediately after the accident gangs of men were putat work repairing the damage, and by night the cars wereagain running. Electrolysis of Pipes. In the abs
. Electric railway gazette . probably was deflectedsomewhat out of the plane of the wheel by striking atruss. Two pieces went through the boiler room wall but causedno more serious damage than deranging the piping. Whileone went completely through the boiler room, several pieceswere found on the northern side, which must have gonethrough the roof. One of these, weighing a ton, landedin an old canal boat, 330 feet away from the engine room. Immediately after the accident gangs of men were putat work repairing the damage, and by night the cars wereagain running. Electrolysis of Pipes. In the absence of a complete solution the electrolyticproblem tends to become more formidable. The troubleextends to a multiplicity of metallic pipes whose combinedvalue is regarded by the public as much greater than thebenefits of a rapid transit service. There are buried inthe thoroughfares, water and gas pipes, telephone andtelegraph cables, pneumatic tube systems, steam pipesand branch sewers, and they are often interlaced in the. most confusing manner. The problem is complicated, too,by the varying conductivity of the earth itself. It has been customary to search out electrolytic prob-lems with a low reading voltmeter, the terminals of whichare applied to different points in the earth, or in the pipesystems. It is well known that a difference of potentialof over half a volt will produce electrolytic action, but manywriters on this subject have not correctly considered theindications of the voltmeter. The rate of electrolyticaction depends not on the voltage, but on the currentpassing, and it must be leaving the pipe, i. e., the pipemust be positive to the surrounding conductors in orderthat it may be consumed at all. Hence a great deal of discrimination must be used inacting on a voltmeter indication in such work. A readingof a difference of potential of one half a volt in dry, sandysoil does not present one tenth the significance that a simi-lar indication denotes when the ground i
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Keywords: ., bookcentury1800, bookdecade1890, bookpublishernewyo, bookyear1895
