. Electric railway journal . laced almost directly over the trackswitch point, preventing the side wear of the wirecaused by the angular riding of the wheel before itenters the frog. When the frog is placed in its proper February 27, 1915] ELECTRIC RAILWAY JOURNAL 429 location the wheel will be in a position to engage theturnout runner before it commences to grind the sideof the wire. Due to the over-lapping of the runners, asshown in the illustration, practically continuous con-tact of the tread of the wheel is afforded during theperiod of transition. Hints on the Impregnation of RailwayMotor
. Electric railway journal . laced almost directly over the trackswitch point, preventing the side wear of the wirecaused by the angular riding of the wheel before itenters the frog. When the frog is placed in its proper February 27, 1915] ELECTRIC RAILWAY JOURNAL 429 location the wheel will be in a position to engage theturnout runner before it commences to grind the sideof the wire. Due to the over-lapping of the runners, asshown in the illustration, practically continuous con-tact of the tread of the wheel is afforded during theperiod of transition. Hints on the Impregnation of RailwayMotor Coils The reinsulation of formed wire by impregnation,especially for field coils of traction motors, has becomea regular feature of electric railway practice, for withproper workmanship a saving up to 25 per cent of thecost of a new coil is attainable. Many of the early at-tempts at impregnation were not successful, becauseboth railways and manufacturers lacked experience andproper equipment. In recent years these drawbacks. QUADRUPLE TANK EQUIPMENT FOR VACUUM IMPREGNATIONOF COILS have been overcome by organizations which make theimpregnation of field coils either their sole business ora logical part of their other electrical work. The Elec-tric Operations Company, Brooklyn, N. Y., is a concernof this character, and the following explanation of itsimpregnating practice, as given by A. M. Leacock, man-ager of the electric railway department, should thereforebe of value. The company uses steam-jacketed tanks, one being theliquid (compound) tank and the other the vacuum the latter tank is connected a compressor for sup-plying compressed air or vacuum as desired. The twotanks are connected at the base with a valve intermedi-ate. Coils to be treated are placed in the vacuum tankafter they have been covered with one layer of this tank they are allowed to dry while the compoundis liquefying in the liquid tank. After the highestpossible vacuum has been maintained, say,
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