. Electric railway journal . B. R. T. Electrical Shops—Vacuum Impregnating Equip-ment at Fifty-second Street Shops mation serves as a check on the shop should it ask for acontroller which is not really due for overhauling. Thislast form is also furnished with spaces for recording similarinformation on the overhauling of circuit-breakers, lineswitches and storage batteries. The overhauling of control equipments of elevated carsis carried on at the elevated maintenance shops in accord-ance with a regular annual schedule which shows the loca-tion of elevated cars throughout the system. The change
. Electric railway journal . B. R. T. Electrical Shops—Vacuum Impregnating Equip-ment at Fifty-second Street Shops mation serves as a check on the shop should it ask for acontroller which is not really due for overhauling. Thislast form is also furnished with spaces for recording similarinformation on the overhauling of circuit-breakers, lineswitches and storage batteries. The overhauling of control equipments of elevated carsis carried on at the elevated maintenance shops in accord-ance with a regular annual schedule which shows the loca-tion of elevated cars throughout the system. The changesin the elevated control equipment will be detailed at lengthhereinafter, but it will be appropriate to summarize herethe improvements in surface controllers, the K-n type. B. R. T. Electrical Shops—Dipping and Hanging Coils offering the most typical case on account of the fact thatit is the oldest and most used design on the system. The cost of stripping a K-n controller and replacing allworn material averages about $ for both labor andmaterial. Among the departures which have been madefrom the original design of this controller during the pastfive years are the following: A board of J^-in. vulca- beston has replaced the 1/16-in. fiber barrier- between themain and reverse cylinders; in addition to the single-arcshield above the trolley controller finger four arc shieldshave been installed; the binding posts have been changedto permit the screws to go in perpendicularly so that thewires are no longer cut by the threads as occurred whenthe screws were inserted at an angle to the wire; the backis treated with asbestos and shellacked and all wires andcables are also shellacked. It may be added that the con-troller contact plates are lubricated with va
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