. The street railway review . ing a twelve-inch water main andthen putting a one-half inch pipe alongside to help it No. o B. W. G. copper wire has a resistance of overtwenty times the single track of T railsper foot, and the No. o B. W. G. iron wire over 112 timesthe resistance per foot of the same track. How, then,can either of these be of any adequate assistance for con-ducting current? The writer knows personally of several instanceswhere the copper supplementary wire has absolutely dis-appeared. The writer believes that ninety-nine per centof the money expended fo
. The street railway review . ing a twelve-inch water main andthen putting a one-half inch pipe alongside to help it No. o B. W. G. copper wire has a resistance of overtwenty times the single track of T railsper foot, and the No. o B. W. G. iron wire over 112 timesthe resistance per foot of the same track. How, then,can either of these be of any adequate assistance for con-ducting current? The writer knows personally of several instanceswhere the copper supplementary wire has absolutely dis-appeared. The writer believes that ninety-nine per centof the money expended for so-called supplementary wireis absolutely thrown away. The same money expendedin other directions will give some adequate return. Doesnot this show conclusively that we should give our atten-tion to the more perfect bonding of the rail joints, and alsoto apply track feeders in such a manner as to fully utilizethe conductivity of the track and thereby make it ful-fill the service of which it is capable when properlytreated ?. TJIE HEILMANN LOCOMOTI\E. J. H. VAIL ON RAIL BONDING. A CABLE ROAD PATENT VOID. The paper on The Importance of a CompleteMetallic Circuit for Electric Railways, read at the Na-tional Electric Light Association, by J. H. Vail, wasaccompanied by some practical examples of bonding, in theshape of bonds manufactured by the Electrical Engineer-ing and Trading Company, Edison building. New York,of which Mr. Vail is president. The bond is hereillustrated. We cannot refrain from quoting a fewwords from Mr. Vails paper in regard to the importanceof heavy bonds above everything else in a return circuitalthough we have mentioned it so often before. Aftergiving a table and a chart, showing the relative conduct-tivities of rails and copper wires, he says : The Pacific Cable Railway Companj recently broughtsuit against the Butte City Street Railway Company forthe infringment of the Hallidie patent by the use of a dummy grip car or truck to assist on steep gradesand whe
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