. Electric railway journal . Carnegie Axles More than fifty years ago these were considered the bestobtainable. They are still the standard of excellence. Carnegie Rolled Steel Gear Blanks A prominent gear cutter places his case hardened forgedsteel gears cut from Carnegie blanks at 500 as against 100for his standard cast steel gears. The best are in the endthe cheapest. The mark of lj ■ ft protects the quality user Carnegie Steel Company General Offices—Pittsburgh, Pa. September 22, 1917] ELECTRIC RAILWAY JOURNAL Essential Wheel Requirements. GRIFFIN F. C. S. WHEELS meet them 1. The wearing-
. Electric railway journal . Carnegie Axles More than fifty years ago these were considered the bestobtainable. They are still the standard of excellence. Carnegie Rolled Steel Gear Blanks A prominent gear cutter places his case hardened forgedsteel gears cut from Carnegie blanks at 500 as against 100for his standard cast steel gears. The best are in the endthe cheapest. The mark of lj ■ ft protects the quality user Carnegie Steel Company General Offices—Pittsburgh, Pa. September 22, 1917] ELECTRIC RAILWAY JOURNAL Essential Wheel Requirements. GRIFFIN F. C. S. WHEELS meet them 1. The wearing- surface shall be of sufficient hardness tocarry the heaviest concentrated loads without excessivedeformation over irregular tracks at high speeds. 2. The wearing surface must be such that a maximum serv-ice can be rendered per unit of metal worn away. 3. The tread surface having the greatest coefficient of fric-tion when in contact with brake shoe. 4. The character of the tread surface that will allow thegreatest brake shoe durability per unit of retardation. 5. The character of the wearing surface must be such as willbe least destructive to the rail. The intensity of the internalstresses in the rail depend somewhat on the character of themetal of the wheel, which transmits the heavy concentratedload through a very small surface of metal. 6. The character of the wearing surface of the tread must besuch as will produce the least amount of rail abrasion. 7. The surface of the tread of the wheel must be such thattrain resistance arising f
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