. A manual of marine engineering: comprising the design, construction, and working of marine machinery. s and their connections, made for pressures up to 300 lbs. (4) The express water-tube boiler, having small straight or bent tubes,and made for pressures up to 250 lbs. The Rectangular Boiler, now in use only in old warships and a fewmodern paddle steamers, was made in two distinct ways, and known as adry-bottom or wet-bottom boiler. The wet-bottom boiler was so called becausethe furnaces were inside, and independent of the shell, and wholly sur-rounded with water—that is, the furnaces had we
. A manual of marine engineering: comprising the design, construction, and working of marine machinery. s and their connections, made for pressures up to 300 lbs. (4) The express water-tube boiler, having small straight or bent tubes,and made for pressures up to 250 lbs. The Rectangular Boiler, now in use only in old warships and a fewmodern paddle steamers, was made in two distinct ways, and known as adry-bottom or wet-bottom boiler. The wet-bottom boiler was so called becausethe furnaces were inside, and independent of the shell, and wholly sur-rounded with water—that is, the furnaces had wet bottoms. The dry-bottom boiler differed from this, inasmuch as the sides of con-tiguous furnaces were united at the bottom, so as to form a water spacebetween them, and each furnace was then devoid of a bottom, except theplate fitted to retain the ashes, &c. When steam of 30 lbs. pressure only was used, the dry-bottom boiler wasgenerally found in merchant ships, while the wet-bottom boiler was alwaysemployed in the Navy. There are still such boilers in existence in the COCHRAN S BOILER. 373. Fig. 1296.—Rectangular Boiler.
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