. Electric railway journal . THIS MACHINE MAKES PIPE THREADING ANEASY JOB PIECE OF SPECIAL TRACKWORK REPAIRED BYELECTRIC WELDING June 18, 1921 Electric Railway Journal 1119 Piston Travel and Shoe Clearance* The Relation Between Piston Travel and Shoe Travel Is Determined—With a High Total Leverage SlightShoe Wear Produces a Great Variation in Piston Travel Which Is Objectionable—Various Examples Illustrate Methods for Finding the Motionof Levers and Their Proper Release Positions By H. M. p. murphy THE term total leverage represents the totalnumber of pounds of brake-shoe pressure thatare obta
. Electric railway journal . THIS MACHINE MAKES PIPE THREADING ANEASY JOB PIECE OF SPECIAL TRACKWORK REPAIRED BYELECTRIC WELDING June 18, 1921 Electric Railway Journal 1119 Piston Travel and Shoe Clearance* The Relation Between Piston Travel and Shoe Travel Is Determined—With a High Total Leverage SlightShoe Wear Produces a Great Variation in Piston Travel Which Is Objectionable—Various Examples Illustrate Methods for Finding the Motionof Levers and Their Proper Release Positions By H. M. p. murphy THE term total leverage represents the totalnumber of pounds of brake-shoe pressure thatare obtained for each pound of force exerted onthe brake-cylinder push rod. Consequently it is clearthat in order to obtain any desired degree of brakingforce or percentage of braking power on a given car,with a specified air pressure in the brake cylinder, thegreater the value of the total leverage employed thesmaller is the size of the brake cylinder required, and,therefore, in order to reduce the cost of installationsand also
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