. Electric railway journal . at a higher rate with the same current. In a recent paper there was a statement that a cer-tain automobile touring car was driven 260,000 miles,and that after this mileage had been made the rollerbearings with which it was equipped were still in goodcondition. It would seem, therefore, that an electric carshould have at least three or four times the life of anautomobile, and since the average life of an automobileto-day is estimated at three years, roller bearings onan interurban car should last until the end of the usefullife of the car. Universal Coil Winding Mac
. Electric railway journal . at a higher rate with the same current. In a recent paper there was a statement that a cer-tain automobile touring car was driven 260,000 miles,and that after this mileage had been made the rollerbearings with which it was equipped were still in goodcondition. It would seem, therefore, that an electric carshould have at least three or four times the life of anautomobile, and since the average life of an automobileto-day is estimated at three years, roller bearings onan interurban car should last until the end of the usefullife of the car. Universal Coil Winding Machine BY G. R. W. ROBERTS General Foreman Electric Car Equipment Southern PacificCompany, Beaverton, Ore. Many electric roads use a great number of straightwound coils in their multiple unit equipment for relaysand other apparatus. As these are at all times liableto be burned out, means must be provided to rewindthem quickly and cheaply. A supply of the varioussizes of wire with which they are wound can always Wing Nut- rSlot. UNIVERSAL COIL-WINDING MACHINE—SHAFT, BEARINGS, SUPPORTING CONES, ETC. MAY 6, 1916 ELECTRIC RAILWAY JOURNAL 867 be kept in stock, and whenever one burns out it is amatter of only a few hours to make repairs with a ma-chine like the one illustrated herewith. The construc-tion is very simple and the device can be made fromfittings and other material to be found around any carshops. The shaft of the machine is % in. in diameter by 24in. long. It is threaded for two-thirds of its lengthand turned down at one end to V2-in. in diameter forthe end bearing. A lVi-in. T can be used for the mainbearing by boring it out and bushing it with brass. Onthe driving end of the shaft is mounted a grooved pul-ley for a Vi-in. round belt. Two cones, with about 30per cent taper, the big ends being about 2 in. in diam-eter, are provided to hold the coil frames or cone next the driving wheel is solid on the shaft,while the other slides easily over its threaded porti
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