. The steam-engine and other heat-motors. -revolution if the steam- and exhaust-valves are operated byindependent eccentrics. If, however, only one eccentric is used,the necessity of having the exhaust-valve open and close at properpoints practically limits the detachment of the steam-valve be-tween the dead-center and 3/8 stroke positions of the double eccentrics by giving the steam-valve negative steam-lap and its eccentric negative angular advance later points thanthat above given may be obtained. When the stroke is short compared with the diameter of thecylinder the method of c
. The steam-engine and other heat-motors. -revolution if the steam- and exhaust-valves are operated byindependent eccentrics. If, however, only one eccentric is used,the necessity of having the exhaust-valve open and close at properpoints practically limits the detachment of the steam-valve be-tween the dead-center and 3/8 stroke positions of the double eccentrics by giving the steam-valve negative steam-lap and its eccentric negative angular advance later points thanthat above given may be obtained. When the stroke is short compared with the diameter of thecylinder the method of connection illustrated in Figs. 195 and 198is used; if the stroke is long compared with the diameter of thecylinder, the form shown in Figs. 19G and 197 may be used. The following method of setting the valves applies to single-eccentric engines of the following types: Reynolds, Twin City,Hamilton, Murray Bates, Cooper, Monarch (old), Harris, Hardy-Tynes, Lane and Bodley, and all others of similar valve arrangemcnt. REVOLUTION CONTROL. 369. Fig. 198. Tublt First. Place wrist-plate D in central position as shown inFig. 196, with both valves hooked on, so that mark on wrist-platehub will coincide with center mark onstud; loosen stud-nut and place a pieceof cardboard between washer and wrist-plate and tighten so that wrist-plate willnot move. Second. Loosen lock-nuts on shackle-rods and adjust valves until they havelaps as found in table (which are given inparts of an inch opposite size of cylinder),after which set up lock-nuts securely. Third. Plumb rocker-arm by hang-ing a plumb-line over center of pins?then adjust hook-rod between rocker-arm and wrist-plate. Fourth. Remove cardboards so wrist-plate and rocker-armcan oscillate; now connect eccentric-rod to rocker-arm and revolveeccentric on shaft in the directionthe engine is to run, being carefulthat mark on wrist-plate coincideswith side marks on stud whenmaking adjustments of the eccen-tric rod. Next adjust dash-potrods H as fo
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