Twentieth century hand-book for steam engineers and electricians, with questions and answers .. . FIGURE 41. the employment of gears and pulleys of different diam-eters, the motion is reduced to within the compass ofthe drum, and the device is applicable to almost anymake of engine, whether of high or low speed. Somemakers of indicators attach the reducing wheel directlyto the indicator, thus producing a neat and very con-venient arrangement. Fig. 42 shows the indicatorcomplete with reducing wheel attached. One of the most accurate and easily applied devicesfor reducing the motion of the pisto
Twentieth century hand-book for steam engineers and electricians, with questions and answers .. . FIGURE 41. the employment of gears and pulleys of different diam-eters, the motion is reduced to within the compass ofthe drum, and the device is applicable to almost anymake of engine, whether of high or low speed. Somemakers of indicators attach the reducing wheel directlyto the indicator, thus producing a neat and very con-venient arrangement. Fig. 42 shows the indicatorcomplete with reducing wheel attached. One of the most accurate and easily applied devicesfor reducing the motion of the piston is the wooden 176 ENGINEERING pendulum in its various forms. (See Figs. 43, 44 and45.) It consists of a flat strip of pine or other lightwood of a length net les , than one ard a half times thestroke of the engine, a:id if made longer it will bebetter. It should be from % to ]/b in. thick and havean average width of abjut4in. If the engine to be. FIGURE 42. indicated is horizontal the bar or pendulum is to bepivoted at a fixed point directly above and in line withthe side of the crosshead, as that is generally the mostconvenient point of attachment. The pivot can befixed to a permanent standard bolted to the frame ofthe engine (Fig. 46), or it may be secured to the ceil- THE INDICATOR 177 ing of the room or even to a post fastened to the the engine is vertical the bar can be pivoted to thewall of the room or a strong post firmly secured to thefloor. The .connection with the crosshead is bestaccomplished by means of a short bar or link. A con-venient length for this bar is one-half the stroke of theengine. To locate the correct point for the pivot,
Size: 1765px × 1415px
Photo credit: © The Reading Room / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, bookdecade1900, bookpu, booksubjectsteamturbines
