. Railway and locomotive engineering : a practical journal of railway motive power and rolling stock . open the pas-sage of the gases when the throttle isopened and the steam flowing throughthe superheater pipes. An improper in-stallation of the damper in its connectionsif apt to defeat the purpose for which thedevice is intended. It can be readily un-derstood that if the damper fails to closeproperly it will not effectually prevent hotgases entering the large flues when thethrottle is closed; and again if the dam-per does not open properly it will havethe effect of a baffling plate in the fro
. Railway and locomotive engineering : a practical journal of railway motive power and rolling stock . open the pas-sage of the gases when the throttle isopened and the steam flowing throughthe superheater pipes. An improper in-stallation of the damper in its connectionsif apt to defeat the purpose for which thedevice is intended. It can be readily un-derstood that if the damper fails to closeproperly it will not effectually prevent hotgases entering the large flues when thethrottle is closed; and again if the dam-per does not open properly it will havethe effect of a baffling plate in the frontend and divert part of the gases, causingpoor steaming of the engine, or prevent-ing the desired degree of superheatingfrom being obtained. When the damper is open, it should^itand in such a position that it will bedirectly parallel to the current of gasesflowing through the damper opening. Ifit does not open far enough, or opens toofar, it will have the effect of baffling thegases. The changes in temperature also,in some cases, have the effect of warpingthe damper, which influences the correct-. installed, may cease to give the properdamper opening. Fig. 1 illustrates thiscondition, and is based on the assumptionthat there has been a total wear of J4 the various pins. This is about theamount of wear that might be expectedin a damper that has been in service for Fir,. I, DAMPEK CONDITIONS WITH ATOTAL of .. IN. ON PINS ANDBEARINGS. ness of operation. The bearing partswear, and the occurring lost motion hasa pernicious effect on the efficiency of thelocomotive. This wear, as may be ex-pected, is cumulative, so that damperrigging which was originally correctly
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