. Electric railway journal . after fifty blows with a dropof 20 in., and each Davis wheel stood at least four blowswith a 40-in. drop of the hammer before a fracture oc-curred. In actual tests none of the steel wheels werebroken under less than a blow from a height of 80 in. Professor Endsley also made friction tests in astandard M. C. B. brake shoe testing machine with astandard cast-iron brake shoe and a rail shoe made of apiece of 80-lb. rail bent to conform to the wheel con-tour and of the same length as the standard cast-ironbrake shoe. This test showed that the coefficient fric-tion betw
. Electric railway journal . after fifty blows with a dropof 20 in., and each Davis wheel stood at least four blowswith a 40-in. drop of the hammer before a fracture oc-curred. In actual tests none of the steel wheels werebroken under less than a blow from a height of 80 in. Professor Endsley also made friction tests in astandard M. C. B. brake shoe testing machine with astandard cast-iron brake shoe and a rail shoe made of apiece of 80-lb. rail bent to conform to the wheel con-tour and of the same length as the standard cast-ironbrake shoe. This test showed that the coefficient fric-tion between the Davis wheel and the standard cast-ironbrake shoe was approximately the same as that for thecast-iron shoe and the rolled-steel wheel. The coeffi-cient of friction between the Davis wheel and the railshoe, however, was from 9 per cent to 48 per cent higherthan that for either the cast-iron or the rolled-steelwheels. This quality is of great advantage in startingacceleration as it reduces the amount of wheel Single-Truck, Arch-Roof Cars of theUnited Traction Company, Albany An instructive example of superior service econom-ically rendered is afforded by the substitution of modernsingle-truck cars weighing 22,000 lb. each for double-truck cars weighing 48,000 lb. each on the Belt Lineof the United Traction Company, Albany, N. Y. Theheadway has been cut from seven to five minutes withconsiderable satisfaction. The United Traction Company now has in servicefifteen of these cars, built by the Wason Car Company,and ten more are under construction by the Laconia CarCompany. The first three cars went into operation onMarch 25, 1916. Their general dimensions and otherdata are given in the accompanying table. The bottom framing is of steel throughout with % girder plates bent around the corner posts frombulkhead posts to bulkhead posts and riveted to thelower sill angle, which is made in one length and splicedin the center of the end sill. The cross joists arep
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