. Railroad construction. Theory and practice . Fig. 189. Fig. 190. (a) Radial stays. This construction is indicated in Fig. there is also shown the diagonal braces for resist-ing the pressure on the back end of the boiler above the fire-box. It may be seen that the stays are not perpendicular toeither the crown-sheet or the boiler-plate. This is objection-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 (c) Belpaire fire-box. The boiler above the fire-box is rect
. Railroad construction. Theory and practice . Fig. 189. Fig. 190. (a) Radial stays. This construction is indicated in Fig. there is also shown the diagonal braces for resist-ing the pressure on the back end of the boiler above the fire-box. It may be seen that the stays are not perpendicular toeither the crown-sheet or the boiler-plate. This is objection-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 (c) Belpaire fire-box. The boiler above the fire-box is rect-angular, 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- §318. ROLLING-STOCK. 345 box. Perfect combustion requires that all the carbon shall beturned into carbon dioxide, and this is facilitated by theforced
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