. Railway and locomotive engineering : a practical journal of railway motive power and rolling stock . at 60 than at 0 miles anhour, and which consequently causes thetrain-retarding effect to be less in thefaster than in the slower speed. The writer means to argue that in fast-moving trains it is the presence of thegreat momentum of the car in combinationwith the lubricating effect of a very hotshoe face in sliding contact with the swift-ly passing face of a comparatively coldwheel that decreases, and in slow-moving 82 LOCOMOTIVE EKGINEERING February, 1901. trains the absence of these opposing
. Railway and locomotive engineering : a practical journal of railway motive power and rolling stock . at 60 than at 0 miles anhour, and which consequently causes thetrain-retarding effect to be less in thefaster than in the slower speed. The writer means to argue that in fast-moving trains it is the presence of thegreat momentum of the car in combinationwith the lubricating effect of a very hotshoe face in sliding contact with the swift-ly passing face of a comparatively coldwheel that decreases, and in slow-moving 82 LOCOMOTIVE EKGINEERING February, 1901. trains the absence of these opposing effectsthat increases the coefficient of friction be-tween the brake shoe and car wheel, andthat the effect of centrifugal force can inno way figure in the solution of the for instance any certain car in a face bearing, with many hundred poundspressure, against the swiftly gliding faceof a comparatively cold wheel, and the carof 24,000 pounds weight and over, plung-ing through the air at the rate of a milea minute maintaining this heated condi-tion of the shoe face until the formers. INCH PUMP BORING BAR, BY HARDY. irain moving at the rate of only 6 miles anhour and let the brakes be suddenly andfully applied. The effect is quite a shockor sudden jar to the car or person within,because the great force witli which thebrake is applied so quickly overcomes theslower momentum of the car; or, moreclearly, the braking force is so unneces-sarily powerful in proportion to the mo-mentum stored up in the moving car, and,further, the cold brake shoe so closelyhugs the slowly revolving wheel, produc-mg the most perfect means of retardationto the rotation of the wheel, that it stopsit perhaps before it makes one completerevolution and without producing anyappreciable amount of heat in the shoe. Now let us consider this car to be in atrain moving at the rate of 60 miles anhour, and let the brakes be suddenly andfully applied, excepting quick action. Noappreciable jar is
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Keywords: ., bookcentury1900, bookdecade1900, booksubjectrailroa, bookyear1901
