. Railroad construction, theory and practice; a text-book for the use of students in colleges and technical schools . Fig. 189. Fig. 190. boiler pressure, the plates, which are 1^ to f thick, must bestayed to prevent the fire-box from collapsing. This is easilyaccomplished over the larger part of the fire-box surface by 436 RAILROAD CONSTRUCTION. §403, having the outside boiler-plates parallel to the fire-box platesand separated from them by a space of 3 to 5. The plates. V V V V ^ V t::* ^- v^ Am^^ are then mutually held by stay-bolts/^ See Fig. 189. Theseare about | in diameter and spaced 4
. Railroad construction, theory and practice; a text-book for the use of students in colleges and technical schools . Fig. 189. Fig. 190. boiler pressure, the plates, which are 1^ to f thick, must bestayed to prevent the fire-box from collapsing. This is easilyaccomplished over the larger part of the fire-box surface by 436 RAILROAD CONSTRUCTION. §403, having the outside boiler-plates parallel to the fire-box platesand separated from them by a space of 3 to 5. The plates. V V V V ^ V t::* ^- v^ Am^^ are then mutually held by stay-bolts/^ See Fig. 189. Theseare about | in diameter and spaced 4 to 4^. The A hole,drilled Uf deep, indicated in the figure, will allow the escape §403. ROLLING-STOCK, 437 of steam if the bolt breaks just behind the plate, and thus callsattention to the break. The stay-bolts are turned down to adiameter equal to that at the root of the screw-threads. Thismethod of supporting the fire-box sheets is used for the twosides, the entire rear, and for the front of the fire-box up to theboiler-barrel. The furnace tube-sheet^—the upper part ofthe front of the fire-box—is stayed by the tubes. But the topof the fire-box is troublesome. It must always be coveredwith water so that it will not be burned^ by the intense must therefore be nearly, if not quite, flat. There are threegeneral methods of accomplishing this.
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