. The street railway review . d a rocker clutchwhich is simply a movable piece of metal, so placed as to spread the and nioiuh cnU. on any rail, in any weather, without skiddingwheels. The durability of the machine is shown by the fad. that when ex-amined after four months steady running, having made approxi-mately miles, and 196,000 stops, the band linings, upon whichthe frictiiMial pressure is most severe had not worn down onehundredth part of an inch. This fact and the simplicity of replacingthe wearing parts are important features. The brake completeweighs about 175 lbs. Mr. J. B. P
. The street railway review . d a rocker clutchwhich is simply a movable piece of metal, so placed as to spread the and nioiuh cnU. on any rail, in any weather, without skiddingwheels. The durability of the machine is shown by the fad. that when ex-amined after four months steady running, having made approxi-mately miles, and 196,000 stops, the band linings, upon whichthe frictiiMial pressure is most severe had not worn down onehundredth part of an inch. This fact and the simplicity of replacingthe wearing parts are important features. The brake completeweighs about 175 lbs. Mr. J. B. Perry, director of the McColhim Bedford , is about to form a company in the United States to handlethis brake. WESTINGHOUSE ELECTRO-PNEUMATIC CON-TROL OF MOTORS. One of the latest publications cf the Westinghouse Air BrakeCo. is a pamphlet of 40 pages descriptive of the electro-pneumaticsystem for controlling railway and other motors which has beendeveloped by that company. This system involves the use of com-. THE McCOLLUM COMPOUND FRICTION BRAKE. sections apart when given a turning or tw-isting motion. Thispiece projects far enough from the side of the first wheel to engage,at its end nearest the axle, a recess in the second wheel as shown inthe cut. Both wheels turn together at the same speed, being con-nected by the clutch. A steel band lined with J4 in. of compressed paper encircles theperiphery of each wheel, the band on the loose wheel being compres-sible, and the band on the expanding keyed wheel being rigid. Tothis second band is attached the ordinary brake chain that operatesthe shoes through levers. To operate the brake the motorman, with suitable connectingrods and a draw lever on the cab, by gently pulling the lever afew inches, compresses the band on the loose running wheel, re-tarding its motion, and thereby twisting or rocking the loose clutch,which, in its turn, expands the other wheel within the rigid circularband, causing this band to revolve
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Keywords: ., book, bookcentury1800, bookdecade1890, booksubjectstreetrailroads
