. Electric railway journal . gcurve sheet, Fig. 7, shows the considerable variations incost per 1000 car-miles of steel and composition latest wheel adopted is 4^ in. in diameter and weighs1^4 lb. It has been in service only a few months, so thatit is not yet possible to state whether it is likely to becomethe standard. ACTUAL COSTS OF WHEELS AND BUSHINGS (NEW MATERIAL ONLY I Compositiou 60 s ee T rol Wheels 1— Wheels i Present VI heels 1 1 1 1 J J r r _ — ® - — If 9 -3 3 E. « -i 3 5T o S != -13 n, S ° ~ B> So K i ; ^ < i < S - ? f 1907 190S IOOO Flertric Bu. Jonrml Fig. 8—
. Electric railway journal . gcurve sheet, Fig. 7, shows the considerable variations incost per 1000 car-miles of steel and composition latest wheel adopted is 4^ in. in diameter and weighs1^4 lb. It has been in service only a few months, so thatit is not yet possible to state whether it is likely to becomethe standard. ACTUAL COSTS OF WHEELS AND BUSHINGS (NEW MATERIAL ONLY I Compositiou 60 s ee T rol Wheels 1— Wheels i Present VI heels 1 1 1 1 J J r r _ — ® - — If 9 -3 3 E. « -i 3 5T o S != -13 n, S ° ~ B> So K i ; ^ < i < S - ? f 1907 190S IOOO Flertric Bu. Jonrml Fig. 8—Brooklyn Power Equipment—Passenger SurfaceTrolley Wheel Costs on Mileage Basis A feature of the elevated trolley wheel, which is shownin Fig. 8, is the oil well with bronze bushings and rattanoil feeders. This wheel is 5% in. in diameter, weighsabout 5 lb. and is made of per cent copper, percent tin, per cent lead, per cent zinc, with maximum I 112 ELECTRIC RAILWAY JOURNAL. [Vol. XXXIII. No. Fig. 10—Brooklyn Power Equipment—Control Wiring of Semi-Convertible Surface Passenger Cars, 1907 Type JuNii iy, 1909.] ELECTRIC RAILWAY JOURNAL 1113 impurities of per cent. Its average mileage is 1500and its cost per 1000 car-miles is 54 cents to 55 cost is based on a net price of 82 cents per wheel, asthere is 50 cents scrap value in wheels which cost $ new. The standard contact shoe for elevated service has latelybeen redesigned, as per Fig. 9, to eliminate all links andcastings. The shoe is manufactured simply of wroughtiron forged in the companys shops. It is designed for amaximum height variation of 2^2 in. The former shoeconsisted of castings which were continually breaking. Itwas a link-suspended shoe with copper shunts, but in thenew type enough contact is secured through the flat springand the shoe pressure, without using shunts. Fig. 9 alsoshows the sleet brush. This is made of No. 23 B & S gagewire, which is renewed pr
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