. Steel rails; their history, properties, strength and manufacture, with notes on the principles of rolling stock and track design . COEFFICIENT OF SLIP 40 MILES PER HOUR. coefficient OF SLIP 60 MILES PER HOUR Fig. 149. — Tire Wear, Eight-wheel Engines. (Am. Ry. M. Mech. Assn.) 200 STEEL RAILS broken, and the wheels slip through a number of revolutions, usually turningwith considerable velocity. The first case, of slipping through but a small part of a revolution, occursalmost without exception on heavy pulls at slow speed, often being seen whenan engine is pulling hard on a hill with just eno
. Steel rails; their history, properties, strength and manufacture, with notes on the principles of rolling stock and track design . COEFFICIENT OF SLIP 40 MILES PER HOUR. coefficient OF SLIP 60 MILES PER HOUR Fig. 149. — Tire Wear, Eight-wheel Engines. (Am. Ry. M. Mech. Assn.) 200 STEEL RAILS broken, and the wheels slip through a number of revolutions, usually turningwith considerable velocity. The first case, of slipping through but a small part of a revolution, occursalmost without exception on heavy pulls at slow speed, often being seen whenan engine is pulling hard on a hill with just enough sand being used to avoidserious slipping, but not enough to prevent a slight slip at points where therotative force is the greatest. The beginning of slip must occur under theseconditions at or near the maximum of the coefficient of slip. Referring toFig. 148, we find a maximum value of the coefficient of slip at 40° to 50°, and130° to 140° with engine just starting. At 20 miles per hour, the maxima areat 40° and 130°, and at this speed the tendency to slip at 100° is also almost asgreat as at the other points. The figure shows a small spot following 1
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