. The Street railway journal . It is not essential to take into consideration the area of friction, forwhen the area of contact is greater, the weight per square inch of con-tact is less. Within reasonable limits friction is independent of thearea and the velocity. Therefore, it matters not whether the X\x\z,fg,is three-eighths of an inch or three-quarters of an inch long, or in otherwords whether the bevel of the rail is one-eighth of an inch or a quarterof an inch, for it is just a question of velocity. The points along theouter and inner circumferences of the wheel have a little farther to
. The Street railway journal . It is not essential to take into consideration the area of friction, forwhen the area of contact is greater, the weight per square inch of con-tact is less. Within reasonable limits friction is independent of thearea and the velocity. Therefore, it matters not whether the X\x\z,fg,is three-eighths of an inch or three-quarters of an inch long, or in otherwords whether the bevel of the rail is one-eighth of an inch or a quarterof an inch, for it is just a question of velocity. The points along theouter and inner circumferences of the wheel have a little farther to slidein the same time, if the bevel is greater; so they slide faster, but theforce required is the same whether they slide fast or slowly. We havenow found that the force of friction is equal to a direct force of 400lbs. But the force to overcome this force of friction acts at the centerof the car axle and about the fulcrum at the point, c, the power armbeing half the track gauge, 2 ft. ins. -f- 1 ins., the distance from, c,.
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