. American engineer and railroad journal . fitted with my type of water tube firebox in comparison with the ordinary standard firebox of the same size, at leastas far as increased evaporation was concerned, I recently had quartet inch a bi to in ulation placed between them in orderto prevent the tran o the other. In this way tin fin In. ,th halves and the amount of heal received from thi fin the same for both designs. The in del was constructed without an outside crown sheet and theti i i II ii pheric pressure. In this way the ai tual circulation of the . und the firebox was accurately J. - rv
. American engineer and railroad journal . fitted with my type of water tube firebox in comparison with the ordinary standard firebox of the same size, at leastas far as increased evaporation was concerned, I recently had quartet inch a bi to in ulation placed between them in orderto prevent the tran o the other. In this way tin fin In. ,th halves and the amount of heal received from thi fin the same for both designs. The in del was constructed without an outside crown sheet and theti i i II ii pheric pressure. In this way the ai tual circulation of the . und the firebox was accurately J. - rvi![he models had the following dimensions: Wat ■ iq. in. Wati i ii .I Fireb q. in. Water I 11 I 1 Wai r Heal in Water Heatit Flm I 11 ating .in i ..I i lr !ni ■ .ni] :n9 I w . lii Empty 25 lbs. 10 lbs. Willi lull (24 half pints) 37 lbs. 28 lbs. |e i - ni in. .a in. i. .i . heating trfao 61 ( For boili i « ith tall I ngth of Hui • . Percentagi hi -<mpty . P i ni .ii i I . i -In lull (For i . 20%). VIEW LOOKINC DOWN ON THE CPOWN SHEETS OF THE MODELS. KSflflEH l^^^^j^^M ^m ■ m^ ^^r^: .•Im ■ • «*n ^^••.•s«a &i B^ffii •:* f MODELS JOINED READY FOR TESTS. constructed some models accurately made to a i-in. scale, whicharc shown in the accompanying illustrations. These models areeach a half section of a boiler fitted with my firebox and a halfsection of a boiler arranged with the ordinary standard firebox,the two sections being identical in all respects possible, but eachbeing entirely independent as far as the water circulation is con-cerned. The principal difference in the two consists in the mudring, arrangement of the crown sheet, the introduction of thewater tubes and the addition of ten extra tubes in the barrel ofthe water tube design. The design of this firebox permits thisincrease in the number of fire tubes in the barrel. The two halveswere secured together in the manner shown, there being a one-
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectrailroadengineering
