. Practical physics. 192 CHANGE OF STATE the fire in contact with as large a surface as possible. In the tubularboiler this end is accomplished by cailsing the flames to pass througha laroe number of metal tubes immersed in water. The arrangement. Fig. 18-3. Diagram of locomotive of the furnace and the boiler may be seen from the diagram of a loco-motive shown in Fig. 183. (See early and modern types opposite p. 123.) 237. The draft. In order to force the flames through the tubes B ofthe boiler a powerful draft is required. In locomotives this is obtainedby running the exhaust steam from the c
. Practical physics. 192 CHANGE OF STATE the fire in contact with as large a surface as possible. In the tubularboiler this end is accomplished by cailsing the flames to pass througha laroe number of metal tubes immersed in water. The arrangement. Fig. 18-3. Diagram of locomotive of the furnace and the boiler may be seen from the diagram of a loco-motive shown in Fig. 183. (See early and modern types opposite p. 123.) 237. The draft. In order to force the flames through the tubes B ofthe boiler a powerful draft is required. In locomotives this is obtainedby running the exhaust steam from the cylinder C (Fig. 183) into thesmokestack E through the blower F. The strongcurrent through F draws with it a portion of theair from the smoke box D, thus producing withinD a partial vacuum into which a powerful draftrushes from the furnace through the tubes B. Thecoal consumption of an ordinary locomotive is fromone-fourth ton to one ton per hour. In stationary engines a draft is obtained by mak-ing the smokestack very high. Since in this casethe pressure which is forcing the air through thefurnace is equal to the difference in the weights of columns of air of unit cross section inside and outside the chimney, itis evident that this pressur
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Keywords: ., bookcentury1900, bookdecade1920, booksubjectphysics, bookyear1922
