. The Street railway journal . cted by four banks of tubes. The tubes can be renewed in-dividually, and as they are expanded direct into the drums theconstruction is very simple. There are no complicated headersand joints requiring elaborate machine work. The top drumsare carried by a girder framework independent of the brick-work, and as the bottom drums are built clear at the ends theyare free to move with any expansion or contraction of thetubes; thus strains due to this cause are completely avoided. 220 STREET RAILWAY JOURNAL. [Vol. XXIII. No. 6. The three .steam drums are all connected ab
. The Street railway journal . cted by four banks of tubes. The tubes can be renewed in-dividually, and as they are expanded direct into the drums theconstruction is very simple. There are no complicated headersand joints requiring elaborate machine work. The top drumsare carried by a girder framework independent of the brick-work, and as the bottom drums are built clear at the ends theyare free to move with any expansion or contraction of thetubes; thus strains due to this cause are completely avoided. 220 STREET RAILWAY JOURNAL. [Vol. XXIII. No. 6. The three .steam drums are all connected above the waterlevel by tubes, and likewise the front and mid drum, be-low the water level. The main tubes are straight throughoutthe greater part of their length, but curve with easy bendstoward each end, to enable them to enter the drum radially. The combustion chamber has its three sides lined with fire-brick, the action of which assists to perfect the high-tempera-ture combustion caused by the effective mixing of the furnace. BOILER DIVISION OF MERSEY RAILWAY ROWER STATION gases in the large combustion chamber before the gases giveout their heat to the water-tubes of the boiler. The banks oflubes have fire-brick baffles arranged between them, whichcause the hot gases from the furnace to take a devious coursealong and between them. The temperature of the outgoinggas is said to be reduced to such a minimum that no econo-mizer is necessary. It will be evident also that the circulation of the water shouldbe good. Every tube has a free outlet to the drums at eachend, so that all steam formed has the full area of the tube for itspassage to the steam space, and is not confined in narrow necksor headers. The bottom drums maintain a supply of waterready to take the place of the steam formed, so that there is nopossibility of tubes being filled with steam only. The steam ismade principally in the two front banks of tubes, and thesetubes are inclined at a good angle for allowing the ste
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Keywords: ., bookcentury1800, bookdecade1880, booksubjectstreetr, bookyear1884
