. Railroad construction, theory and practice; a text-book for the use of students in colleges and technical schools, and a hand-book for the use of engineers in field and office . bjection-able and is obviated by the other methods. (b) Crown-bars. These bars are in pairs, rest on the sidefurnace-plates, and are further supported by stays. See Fig,191. (c) Belpaire fire-box. The boiler above the fire-box is rectiangular, with rounded corners. The stays therefore arc per-pendicular to the plates. See Fig. 192. Fire-brick arches. These are used, as shown in Fig. 193, toforce all the gases to circ
. Railroad construction, theory and practice; a text-book for the use of students in colleges and technical schools, and a hand-book for the use of engineers in field and office . bjection-able and is obviated by the other methods. (b) Crown-bars. These bars are in pairs, rest on the sidefurnace-plates, and are further supported by stays. See Fig,191. (c) Belpaire fire-box. The boiler above the fire-box is rectiangular, with rounded corners. The stays therefore arc per-pendicular to the plates. See Fig. 192. Fire-brick arches. These are used, as shown in Fig. 193, toforce all the gases to circulate through the upper part of the fire-box. Perfect combustion requires that all the carbon shall be turnedinto carbon dioxide, and this is faciUtated by the forced circulation. 43g RAILROAD CONSTRUCTION. §404. Water-tables. The same object is attained by using a water-table instead of a brick arch—as shown in Fig. 191. But it hasthe further advantages of giving additional heating-surface and avoiding the continual expense of maintaining the bricks. Onefeature of the design is the use of a number of steam-jets whichforce air into the Qre-box and assist the
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