. Steel rails; their history, properties, strength and manufacture, with notes on the principles of rolling stock and track design . jad to Area of Head Web Base Area of Head sq. in. Web Base 42%21%37% 100 lbs. per yd. Ratio Periphery of Head to Area of Head Web Web Base Base r to Total Area {0 7 Total sq. in. 100% Ratio Total Periphery to Total AreaMoment of Inertia, Modulus, Head, Modulus, Base, Society of Civil Engineers (adopted 1893). 60 Iba. per yd. 21/2

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