. American ENGINEER and Railroad journal . les brides ir rigidifier la feuille. Les diagonales croissent donc les obsèques, les oblaques sont doublement dpour éviter les interférences. Le pare-boue mesure 4 po de large à l'avant et sur les côtés, réduit à 31/2 po à l'arrière. La couronne est continue, s'étendant dans une seule plaque de l'extrémité arrière de la boîte de combustion à l'extrémité avant de la chambre de combustion, la tôle de toit étant réalisée de la même manière. La tôle de toit 12 ft. 3 po de long et la longueur de la tôle de couronne est de 11 pi 5 po. Le dôme est cylindrique avec une selle dôme incurvée. Grilles et cendrier.—les grilles sont dans
1678 x 1489 px | 28,4 x 25,2 cm | 11,2 x 9,9 inches | 150dpi
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. American engineer and railroad journal . ir flanges stiffen the sheet. Wherethe diagonal stays cross the laterals, the laterals are doubledto avoid interference. The mud ring is 4 in. wide at the frontand sides, reduced to 31/2 in. at the back end. The crown sheetis continuous, extending in a single plate from the back endof the firebox to the front end of the combustion chamber, the roof sheet being made in the same way. The roof sheetis 12 ft. 3 in. long and the length of the crown sheet is 11 ft.5 in. The dome is cylindrical with a curved dome saddle. Grates and Ash Pan.—The grates are in four sections, eachwith a separate shaking bar at the back head. The gratesare straight across the back end with a dip toward the center, increasing in depth toward the front. They are supportedat the sides by castings bolted to the firebox sheets, as shownin Fig. 8. These castings also extend across the front andback ends and carry the longitudinal central bearing bars June, 1900. AMERICAN ENGINEER AND RAILROAD JOURNAL. 163 — % MtUlln. % Studa J«8tudJ which are supported at the center of the firebox by the crossbearing bar. The grate bearing castings make tight Jointswith the firebox sheets against asbestos rope and they extendbelow the grates to carry the ash pan. The ends of the gratebars have sockets fitting over projections on the bearers insuch a way as to protect the bearings from accumulations ofashes. The cross bearer is lipped over a boss forged on theunder side of the mud ring and acts as a lateral brace at the center of the firebox as seen in Fig. 11. This figure also shows the bonnet placed over the end of the cross bearer where it passes through the ash pan. The grates have about 50 percent, of air space and are intended for both anthracite andbituminous coal. The ash pan is of 14-in. tank steel put together with % by2 by 2 in. angles and carefully fitted to be air tight. Thejoints with the firebox sheets are made with asbestos rope toprevent air from getting
