. Railway master mechanic [microform] . •• »*>>*»tmm bottom v/ew-Fg, 4—The Allfree-Hubbell Valve Fig. 5—The Allfree-Hubbell Valve. 368 RAILWAY MASTER MECHANIC September, 1904. is familiarly known as the Stevenson motion. Whilethis valve affects the performance of steam within thecylinder by altering the motion of the valve in certainpositions of its stroke, the reduction of the actual clear-ance space is obtained by a redesign of cylinder castingwhich provides short ports and reduces radiating sur-faces. An outline drawing of this cylinder, showing theshort ports, is presented by Fig. 3.
. Railway master mechanic [microform] . •• »*>>*»tmm bottom v/ew-Fg, 4—The Allfree-Hubbell Valve Fig. 5—The Allfree-Hubbell Valve. 368 RAILWAY MASTER MECHANIC September, 1904. is familiarly known as the Stevenson motion. Whilethis valve affects the performance of steam within thecylinder by altering the motion of the valve in certainpositions of its stroke, the reduction of the actual clear-ance space is obtained by a redesign of cylinder castingwhich provides short ports and reduces radiating sur-faces. An outline drawing of this cylinder, showing theshort ports, is presented by Fig. 3. A comparison ofthis illustration with any drawing of a locomotive cyl-inder will clearly disclose the difference in. length ofports and the consequent difference in clearance. The valve is illustrated by Fig. 4 and the valve inposition on its seat is shown by Fig. 5. Fig. 6 illustrates heat is the power in the steam; therefore if heat can besaved, fuel is saved, and more work can be done by anyquantity of steam generated by
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