. American engineer and railroad journal . sons are made at 160, 180 and 200 pounds steam pressure, thesebeing the pressures that fall in the center of the field of ex-periment, and for that reason would be more likely to representcorrect results. As indicated last year, it would seem that this relation couldbe approximately represented by a straight line as shown. Itis also seen that the water consumption for all pressures be-tween 160 and 200 pounds tor the Schmidt superheater is prac-tically the same. Coal Consumpiion.—The pounds of coal per indicated horse-power per hour plotted against de
. American engineer and railroad journal . sons are made at 160, 180 and 200 pounds steam pressure, thesebeing the pressures that fall in the center of the field of ex-periment, and for that reason would be more likely to representcorrect results. As indicated last year, it would seem that this relation couldbe approximately represented by a straight line as shown. Itis also seen that the water consumption for all pressures be-tween 160 and 200 pounds tor the Schmidt superheater is prac-tically the same. Coal Consumpiion.—The pounds of coal per indicated horse-power per hour plotted against degrees of superheat are shownin Fig. 5. The pounds of coal per indicated horse-power perhour were obtained from the curves of Fig. 3, and the degreeof superheat was obtained in the same manner as for Fig. 4. The same pressures of 160, iPo and 200 were used in thiscomparison as in the comparison for steam consumption. This. ■ ti j 1 || 11 h 1 H pi \ 3 i| 1 1 t-a c li mm 1 1 m m 1 f fir pT fit 1 i w P i 1 WW i *Fn isiiff +F+: ii f 600 1 m m ! te :B ^m i 1 i 1 SiF ^*i JM h m i tti%* II m ii k4 m\ r Sj it%-j^ W; its ■s^Ht ■Hajis s- !rr?K~iSi; iiigS m ±if H V f ■U4 p m It ?fei • ?S Fin «ti irri -[■ fei 5**V W^ ^w T^ f:fei;!;H ^i SSvi .•-4ndi SJ3 ^i t r Fi <^ StS i 1 V::i yy-S:: P M vi ffi ffip ^ H^ T=*fR*i sHS M atf tj m W- spijii ffi ^fT M ^ 1 i 11 1 1 4^ i m T^ iff 1 m ■Vt t 1 m s ■.—.z:^ ■ 1 i 1 1 il m r 1 ^ 4 m 1 i 1 1 i IB 1 ll u 11 m 1 i 1 1 III m1 II i 1 1 \\\ 26 so 7J Ut lis ISO I7S 200 US 2S0FIG. 2. 272 AMERICAN ENGINEER AND RAILROAD JOURNAL lULY, 1911. relation lictwecn the coal per indicated liorse-power per lionrand the degree of superheat for pressures of i6o, i8o and 200would seen^ to indicate, as hronght out year, that it couldbe represented by a curve as shown. In other words, the firstSo or 100 <legrees of . does not make the same pro- KALEV
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