. Modern mechanism, exhibiting the latest progress in machines, motors, and the transmission of power, being a supplementary volume to Appletons' cyclopaedia of applied mechanics . ty in the mechanicaldetails of the engines. I. The Latest Types of Stationary Reciprocating Steam-Engines.—The WoodburyEngine is shown in perspective in Fig. 1. Fig. 2 is a vertical section through the cylinderand valve. Fig. 3 is a horizontal section through the steam-chest above the top of the 4 shows the steam-chest with cover removed, exhibiting the back of the relief-plate andwedge. Fig. 5 is an end
. Modern mechanism, exhibiting the latest progress in machines, motors, and the transmission of power, being a supplementary volume to Appletons' cyclopaedia of applied mechanics . ty in the mechanicaldetails of the engines. I. The Latest Types of Stationary Reciprocating Steam-Engines.—The WoodburyEngine is shown in perspective in Fig. 1. Fig. 2 is a vertical section through the cylinderand valve. Fig. 3 is a horizontal section through the steam-chest above the top of the 4 shows the steam-chest with cover removed, exhibiting the back of the relief-plate andwedge. Fig. 5 is an end view of the relief-plate and wedge. Fig. (J is an enlarged view ofthe upper adjusting screw; and Fig. 7 is a back view of the valve. Referring to Fig. 2, steam-pressure is eliminated from the valve A by the relief-plate Bon the back, which is supported against steam-pressure at top and bottom by a forked ordouble wedge C, whose length is about equal to that of the relief-plate. It is obvious that alongitudinal movement of the wedges inward will force the relief-plate away from the valve,and the outward movement of the wedges will let it down toward the valve. The movement. Fig. 1.— ilie Woodbury engine. of the wedges, and consequent adjustment of relief-plate, is accomplished by the two adjustingscrews /1 (Fig. o), wliic% fit looselv through the cross-piece of wedge and are tapped into thtjrelief-plate. The collars m. which form part of adjusting screws, are notched on their periphe-ries, as shown in Fig. 0. and a notch n is made on the wedge opposite eacli screw. The collarhas 100 notches, and therefore admits of a defi-nite degree of adjustment. The adjusting screwhas 10 threads per in., and the taper of wedges is1 in. in 10. One notch on the collar, therefore,representing yj^y of a turn, moves the wetlgelengthwise t^qV? ^f an in., and the relief-plate to-ward or from the valve yooBn of an in., corre-sponding to -fo-tfoTT of an in. on each face of thevalve. The passage k
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Keywords: ., bookcentury1800, bookdecade189, booksubjectmechanicalengineering
