Twentieth century hand-book for steam engineers and electricians, with questions and answers .. . figure 49. are each to be fitted with a pin extending through farenough so that pin C can be hooked into a hole orsocket on the crosshead, while pin D rests in a socketin the top of a post secured to the floor at apoint opposite the center of travel of the crossheadand of such height as will allow the pantograph to liein a horizontal position. Also the distance of the postfrom the guides must be adjusted so as to allow the •device to close up at mid stroke and open out at fullstroke without any st
Twentieth century hand-book for steam engineers and electricians, with questions and answers .. . figure 49. are each to be fitted with a pin extending through farenough so that pin C can be hooked into a hole orsocket on the crosshead, while pin D rests in a socketin the top of a post secured to the floor at apoint opposite the center of travel of the crossheadand of such height as will allow the pantograph to liein a horizontal position. Also the distance of the postfrom the guides must be adjusted so as to allow the •device to close up at mid stroke and open out at fullstroke without any straining of the parts. The pointF of connection for the cord will always have a motion THE INDICATOR 183 parallel with, and simultaneous with, that of the cross-head; the pin to which the cord is attached can be setin any one of the holes that will give the desiredlength for the diagram. The motion given by thisdevice is accurate, although it may become necessary. CROSBY REDUCING WHEEL. in some cases, especially with long stroke engines, tointroduce a guide pulley to carry the cord from thepantograph. Attaching the Indicator. The cylinders of mostengines at the present time are drilled and tapped for 184 ENGINEERING indicator connections before they leave the shop,which is eminently proper, as no engine builder, orpurchaser either, should be satisfied with the perform-ance of a new engine until after it has been accurately,tested and adjusted with the indicator. The main requirements in these connections are thatthe holes shall not be drilled near the bottom of thecylinder where water is likely to find its way into thepipes, neither should they be in a location wherethe inrush of steam from the ports will strike themdirectly, nor where the edge of the piston is liable topartly cover them when at its extreme travel. Anengineer before he undertakes to indicate an engineshould satisfy himself that all these requirements arefulfilled. Otherwise he
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Keywords: ., bookcentury1900, bookdecade1900, bookpu, booksubjectsteamturbines
