. Science of railways . cylinder havingaccurately fitted into it a piston with an area ofexactly one-fifth of a square inch. This pistonmoves freely up and down, and has attached to thetop of the piston rod a disc for supporting the weight is marked with the number of poundsper square inch it will exert on the gauge. From thebottom of the cylinder two tubes project; one forms astand for holding the gauge to be tested, the otherrises at an inclined angle and forms the oil reservoirhaving within it a screw plunger for forcing the oilinward or outward. Screw down on the plunger until
. Science of railways . cylinder havingaccurately fitted into it a piston with an area ofexactly one-fifth of a square inch. This pistonmoves freely up and down, and has attached to thetop of the piston rod a disc for supporting the weight is marked with the number of poundsper square inch it will exert on the gauge. From thebottom of the cylinder two tubes project; one forms astand for holding the gauge to be tested, the otherrises at an inclined angle and forms the oil reservoirhaving within it a screw plunger for forcing the oilinward or outward. Screw down on the plunger untilthe weights are lifted, and then note the reading of thegauge as compared with the weights, counting theweight of piston, piston rod and tray equal to five LOCOMOTIVE APPLIANCES, 221 pounds. The piston should be carefully cleaned ofall oil and gum after each test. , The Ashcrof t Gauge Tester is shown in Fig. 39, andits operation is very similar to that last described,except that instead of known weights being used a. Fig. Gauge Tester. test gauge is attached to the nipple to left of the ver-tical screw plunger, while the gauge to be tested isattached to the nipple on the right. By screwingdown the screw-feed the pressure is graduallyincreased up to the desired limits of the reading of thegauge to be tested. it- h 222 LOCOMOTIVE APPLIANCES The Star Gauge Tester, as illustrated in Fig. 40, isused precisely the same as that shown in Fig. 39, butin the cut the test gauge is not shown and the screwplunger is placed horizontally. An accurate testgauge is attached to one of the nipples {E E) and thegauge to be tested to the other nipple. Screwing inon the plunger wheel {D) increases the pressure of oilto any amount desired. The Utica Gauge Tester is clearly illustrated byFigs. 41 and 42. The latter engraving shows the square-inch testvalve, which con-sists, of a brassdisc provided witha pipe (A) to beconnected with aplunger (D), as inFig. 41. At B is ahardened steel valveand
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