. Official proceedings . ed to be square, or as nearly so as could beobtained by mean^ of trams, but on being placed in service andthe indicator applied, the valves were found to be out ; furtlier-more, the indicator cards will also tell whether your cylinders arebeing properly oiled or not. I will pass around for observationseveral cards showing the effect of insufficient lubrication. Youwill notice that area representing the work done, of the head end,is very much reduced. By increasing the supply of oil from fiveto fifteen drops per minute, the diagrams again become means of the i
. Official proceedings . ed to be square, or as nearly so as could beobtained by mean^ of trams, but on being placed in service andthe indicator applied, the valves were found to be out ; furtlier-more, the indicator cards will also tell whether your cylinders arebeing properly oiled or not. I will pass around for observationseveral cards showing the effect of insufficient lubrication. Youwill notice that area representing the work done, of the head end,is very much reduced. By increasing the supply of oil from fiveto fifteen drops per minute, the diagrams again become means of the indicator we were able to detect a springing inthe valve gear, and this trouble was overcome by substituting anintermediate blade or motion bar of I Beam section for one of arectangular and smaller section. $03 ~s: 10 WHEEL PASS. EMG-PISTON VALVES£0xe&-7eDRW!lR5-ec:.b UBS PRESSUFSeJ inside: 5 exHAUS\ CLtARM^CCai. LEIAD 5. BLIt4l) BACK LiP ECCCMTRIC5PEED ee MILF_5 F-tR HOUR NITIAL. £Oe UBS ^NCC. ATMOaPHERir. I IMF BACK PRESSURE-3-^LBS ZERO PRESfSURF Herewith is an indicator diagram enlarged six times, it be-ing taken from a 20x28, 72 drivers, 10 wheel passenger engine,225 ft)s. boiler pressure, at 22 miles per hour. The engine isequipped with inside admission piston vahes having inside lap 64 Proceedings Railway Club of Pittsburgh. i, and }i exhaust clearance. The valve was set 3V lead fullgear and /^ blind in back-up motion. This card shows very con-spicuously the four events of the stroke, and may be consideredan ideal card for the speed, showing almost equality betweenareas, and cut offs for the two ends, and show^s only 3}^ back pressure. This card was taken when assisting afreight train over a i /r grade. President.—Are there any gentlemen present who wish toask Mr. Dreyfus any questions ? Mr. Hubbell :—I want to say just one word more in refer-ence to ths work. In Mr. Dreyfus remarks he spoke of spring-ing valve movement. Your work,
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