. The steam-engine and other heat-motors. Fig. 195.—Corliss Engine. (From Peabodys Valve-gears.) 368 THE STEAM-ENGINE AND OTHER HEAT-MOTORS. exhaust-valve due to changes in the relative position of the linksOa, a\d\, diiv for movement of the wrist-plate through equal paitsof the arc aia2. An examination of the automatic method of detaching thesteam-valves will show that it can only operate through a crank. ? J ? y^-<) ~J?f\o\~ A° \7 / B_ Fig. 196. Fig. 197. movement of 90 degrees in each stroke, , while Tin is are at liberty to choose the position of these 90 degrees in asemi-
. The steam-engine and other heat-motors. Fig. 195.—Corliss Engine. (From Peabodys Valve-gears.) 368 THE STEAM-ENGINE AND OTHER HEAT-MOTORS. exhaust-valve due to changes in the relative position of the linksOa, a\d\, diiv for movement of the wrist-plate through equal paitsof the arc aia2. An examination of the automatic method of detaching thesteam-valves will show that it can only operate through a crank. ? J ? y^-<) ~J?f\o\~ A° \7 / B_ Fig. 196. Fig. 197. movement of 90 degrees in each stroke, , while Tin is are at liberty to choose the position of these 90 degrees in asemi-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
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