Cyclopedia of applied electricity : a general reference work on direct-current generators and motors, storage batteries, electrochemistry, welding, electric wiring, meters, electric lighting, electric railways, power stations, switchboards, power transmission, alternating-current machinery, telegraphy, etc. . the wheel on therails, is the fiange. Thehole in the center is thehore, and the outsideslightly conical surface of the rim is the tread. The rim maybe of one piece with the body of the wheel or it may carry asteel tire. The cheapest wheel is one made of cast iron with a hardenedtread. Two
Cyclopedia of applied electricity : a general reference work on direct-current generators and motors, storage batteries, electrochemistry, welding, electric wiring, meters, electric lighting, electric railways, power stations, switchboards, power transmission, alternating-current machinery, telegraphy, etc. . the wheel on therails, is the fiange. Thehole in the center is thehore, and the outsideslightly conical surface of the rim is the tread. The rim maybe of one piece with the body of the wheel or it may carry asteel tire. The cheapest wheel is one made of cast iron with a hardenedtread. Two different styles of cast-iron wheels are shown as partsof the trucks in Figs. 9 and 10. These figures should be examinedwith a view to determining the forms used to economize materialand to give strength and stiffness. The tread is hardened or chilledby casting the metal against an iron band placed in the sand mouldto form the tread. The result is such a hard tread surface thatonly an emery grinder will cut it. The principal objections tochilled wheels are the difficulty of truing them and the dangerscaused by chipped flanges and brittle wheels. Cast iron itself isliable to flaws and this liability is increased by the chilling. Forlow-speed service, however, chilled wheels are entirely Fig. 24. Steel-Tired Wheel 120 ELECTRIC RAILWAYS 25 The rolled-steel wheel and the steel-tired wheel are preferredfor high-speed service. Such wheels are free from the objectionsmentioned for chilled wheels and this is well worth the greater the rolled-steel wheels are inone piece like the cast-iron wheels,they are inherently preferable tothe steel-tired wheels which are
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Keywords: ., bookauthoramericantechnicalsoci, bookcentury1900, bookdecade1910
