. The Street railway journal . FIG. 4. FIG. 5.—CROSS SECTION ON C D. FIG. 7.—DIAGRAM OF CONNECTIONS. tubes, however, are stamped to present in cross section the form of aU as shown in Fig. 3. At the ends, however, the tubes are circularin section and are connected in pairs as shown in Fig. 4, which con-stitutes one element of the Serpollet boiler. The .space within thetube in which the water and steam circulate is variable between .4in. and ins. according to the position which the tubes occupyin the boiler, the tubes having the largest spaces being naturallythose farthest from the point wh
. The Street railway journal . FIG. 4. FIG. 5.—CROSS SECTION ON C D. FIG. 7.—DIAGRAM OF CONNECTIONS. tubes, however, are stamped to present in cross section the form of aU as shown in Fig. 3. At the ends, however, the tubes are circularin section and are connected in pairs as shown in Fig. 4, which con-stitutes one element of the Serpollet boiler. The .space within thetube in which the water and steam circulate is variable between .4in. and ins. according to the position which the tubes occupyin the boiler, the tubes having the largest spaces being naturallythose farthest from the point where the water is fed into the is easy to see that the form of the tubes presents the maximumresistance possible to deformation as well in one direction as in an-other. In tramway work the tubes are of two kinds and arranged intwo ways, as shown in Fig. 6, part being horizontal and part ^1 IFIG. 6.—LONGITUDINAL SECTION. The first row above the furnace into which the water is injected arecircidar in section and horizontal. Above these are U shaped hori-zontal tubes, and beyond U shaped vertical tubes. The con-nections between the elementary steel tubes are made by jointswhich are always kept out of the action of the heat and are devel-oped in a material which is a non-conductor of heat. The draughtis .stimulated by means of the exhaust which discharges at the baseof the stack, as .shown in Fig. 6. The stack is itself surrounded bya false concentric stack which assists to draw air through the doubleenvelope surrounding the boiler and thus diminishes the radia-tion. The first application of the Serpollet motor for tramways wasmade in December, 1893. It was put in operation on the lines of the is shown in Fig. 7. Upon starting the feedwater is injected into theboiler by a pump, P, which is operated by hand and which pumpsdirectly into the boiler, T. As soon as s
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Keywords: ., bookcentury1800, bookdecade1880, booksubjectstreetr, bookyear1884
