Appletons' cyclopaedia of applied mechanics: a dictionary of mechanical engineering and the mechanical arts . agram from thetop of the cylinder by raising the terminal pressure, as shown in Fig. 2403. Defects in the design and adjustment of valves and valve-gear, leaks of the valves or pistons, aswell as the quality of the steam and the thermal condition of the steam-cylinder, may all be ascer-tained from indicator diagrams which have been carefully taken with a good instrument. When theeccentric is too far ahead, the diagram shows an excess of lead, as represented in Fig. 2391. Steamis taken
Appletons' cyclopaedia of applied mechanics: a dictionary of mechanical engineering and the mechanical arts . agram from thetop of the cylinder by raising the terminal pressure, as shown in Fig. 2403. Defects in the design and adjustment of valves and valve-gear, leaks of the valves or pistons, aswell as the quality of the steam and the thermal condition of the steam-cylinder, may all be ascer-tained from indicator diagrams which have been carefully taken with a good instrument. When theeccentric is too far ahead, the diagram shows an excess of lead, as represented in Fig. 2391. Steamis taken at u before the end of the stroke, and the receiving line ug is inclined. With a slide-valvethe point of release k will also be farther away from end of stroke, showing an early exhaust. In loco-motives and rapidly-moving engines early steam and exhaust lead is , to cushion the recipro-cating parts. (See Figs. 2398, 240, and 2401.) When the eccentric is behind, the steam andexhaust lines incline in the opposite direction, as shown in Fig. 2392. Generally, too, the steam line 2391. 2303.
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