. The railroad and engineering journal . the extreme positions of the reversing lever, is clearly in-dicated in an English patent—that of Dawes, No. 1,857 ofthe year 1872—that Is to say, at a time before the first ap-plications of the principle of double expansion to locomo-tives. To avoid reaction of the steam thus introduced in theintermediate reservoir upon the small piston and to providefor the absence of a retaining valve, Herr Lindner makesin the slide-valve two small holes of about i sq. cm. insection, as is shown in fig. 11. In starting, steam fromthe intermediate reservoir can thus re
. The railroad and engineering journal . the extreme positions of the reversing lever, is clearly in-dicated in an English patent—that of Dawes, No. 1,857 ofthe year 1872—that Is to say, at a time before the first ap-plications of the principle of double expansion to locomo-tives. To avoid reaction of the steam thus introduced in theintermediate reservoir upon the small piston and to providefor the absence of a retaining valve, Herr Lindner makesin the slide-valve two small holes of about i sq. cm. insection, as is shown in fig. 11. In starting, steam fromthe intermediate reservoir can thus reach the two faces of the small piston when It is not in position to be acted uponby the steam from the boiler, and which is thus put inequilibrium. These openings are so small that they haveno effect when the engine is running. In some engines,instead of the valve above described. Herr Lindner hasused an arrangement opening an auxiliary passage to theintermediate reservoir, which is similar to the first ar-rangement adopted by Von Borries. As to this apparatus,the questions in discussion are, whether its efficiency is asgreat as that of the automatic retaining valve, and whetherthe necessity of throwing the reversing lever forward toits full extent is not more troublesome than the workingof a small lever. Krauss, at Munich, has modified thisapparatus, replacing the passages in the valve by the ad-dition between the valve and the intermediate reservoir ofa small valve, or rather of a flat plate which receives itsmotion from the cross-head of the small cylinder. Whenthe piston is about at the middle of its
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Keywords: ., bookcentury1800, bookdecade1880, booksubjectrailroa, bookyear1887
