. Science of railways . uter, while pulling it down increases the quantitypassing to the right hand distributer—thus furnishing a meansfor keeping the fire even across the firebox. It will be notedthat this discharge regulator is designed and located so thatthe rolling of the locomotive as it passes around curves orover uneven track has no effect on the distribution, regard-less of whether the locomotive is on a level track. LOCOMOTIVE APPLIANCES. 133 The controller is a small steam valve of very simple and carries a lever pivoted thereto, having on itsupper end a roller for eng
. Science of railways . uter, while pulling it down increases the quantitypassing to the right hand distributer—thus furnishing a meansfor keeping the fire even across the firebox. It will be notedthat this discharge regulator is designed and located so thatthe rolling of the locomotive as it passes around curves orover uneven track has no effect on the distribution, regard-less of whether the locomotive is on a level track. LOCOMOTIVE APPLIANCES. 133 The controller is a small steam valve of very simple and carries a lever pivoted thereto, having on itsupper end a roller for engaging projection on the controllercam. On the lower end of this lever there is a handle foropening this valve by hand. The valve body is made of brass,with brass fittings, the lever of malleable iron, the valve seatand stem of steel, and all of the parts are made as rugged asit is possible to make them. The controller lever which carries the roller, as shown inFig. 32, also carries the adjusting screw or engaging boss. Fig. 32—Controller Valve and Lever • which compresses the valve stem and opens the valve inter-mittently at regular or irregular intervals, depending uponthe number of cams turned out for use on the controller camhead. The controller cam head is in the form of a disc aboutlive and one-half inches in diameter mounted on the end ofthe sprocket wheel shaft and revolves at a constant speed ofabout thirty revolutions per minute. It has four projectionswhich can be thrown in or out by the fireman, • and whenthrown out they come in contact with the end of the controllerlever and open the controller valve intermittently, admitting 134 LOCOMOTIVE APPLIANCES. steam to the distributers. There are projections of eight dif-ferent sizes, which give the fireman the option of using jetsof eight graduated durations of time and having one, two,three or four jets per revolution of the cam. The distanceto which the coal is projected into the firebox is governed bythe number
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