. Electric railway journal . of insulation on wire. The report of last yearscommittee on maintenance and inspection showed very con-clusively that the system of impregnating coils has grownin favor during the past two or three years and that econ-omy has followed this method. It has also been demon-strated that immersing armatures that have exposed wind-ings such as W. P. 50s., Westinghouse 12s and 68s, etc.,and those of air compressor motors has proven decidedlybeneficial. Trolley wheel economy has been obtained by using wheels6 in. in diameter, and, after getting 3000 or 4000 miles wear,on i
. Electric railway journal . of insulation on wire. The report of last yearscommittee on maintenance and inspection showed very con-clusively that the system of impregnating coils has grownin favor during the past two or three years and that econ-omy has followed this method. It has also been demon-strated that immersing armatures that have exposed wind-ings such as W. P. 50s., Westinghouse 12s and 68s, etc.,and those of air compressor motors has proven decidedlybeneficial. Trolley wheel economy has been obtained by using wheels6 in. in diameter, and, after getting 3000 or 4000 miles wear,on interurban lines, placing them on cars in city service at [Vol. XXXIV. No. 14C. slower speeds. In this way 6000 or 7000 miles of wear issecured, whereas it would only be possible to secure notmore than 5000 miles in the faster service alone. Lubrication Lubrication has a direct bearing on expense, as unreliablemethods seriously affect armature conditions. In last yearsreport of the committee on maintenance and inspection will. Rolling Stock Equipment—Oil Cup Used by United Railwaysof St. Louis be found some successful methods of applying oil to theolder types of motors, originally intended for grease. In thispaper two additional designs of oil cups used by the United
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