. The railroad and engineering journal . communicates with the exhaust. When the valve occu-pies the position shown in fig. 29 the hammer is at rest,and steam cannot enter the cylinder or act upon either faceof the piston. The general custom is to open the port wide when thesteam acts on the lower face of the piston, raising the ham-mer, and to give only a half opening when the steam actsupon the upper face of the piston. All hammers used for making large forgings have thevalves worked by hand. blows, the automatic working is very useful, but for morepowerful hammers, in which the changing or
. The railroad and engineering journal . communicates with the exhaust. When the valve occu-pies the position shown in fig. 29 the hammer is at rest,and steam cannot enter the cylinder or act upon either faceof the piston. The general custom is to open the port wide when thesteam acts on the lower face of the piston, raising the ham-mer, and to give only a half opening when the steam actsupon the upper face of the piston. All hammers used for making large forgings have thevalves worked by hand. blows, the automatic working is very useful, but for morepowerful hammers, in which the changing or moving ofthe pieces on the anvil requires a certain time, and which,consequently, are not required to act very swiftly, the handworking is sufficient, and the automatic working can bedispensed with. Quickness of movement is especially desirable in work-ing steel and in forging small pieces, which ought to bedrawn into shape at a smgle heat. In automatic hammers the admission of steam to raise 126 THE RAILROAD AND [March, 1889. the hamme
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Keywords: ., bookcentury1800, bookdecade1880, booksubjectrailroa, bookyear1887
