. A manual of marine engineering: comprising the design, construction, and working of marine machinery. vice ; thisingenious method is the invention of Mr. Frank Pearn, whose double pumps(fig. 122) with crank and flywheel are perhaps the best of that type in themarket, and whose single pumps of wall type are such favourites for feedingsmall boilers. Auxiliary pumps should have bronze water ends andfittings, the plungers or pistons packed with ebonite or woodite, the rod ofrolled bronze of best quality, for standing shock, and the valves small andnumerous so as to give the maximum amount of per
. A manual of marine engineering: comprising the design, construction, and working of marine machinery. vice ; thisingenious method is the invention of Mr. Frank Pearn, whose double pumps(fig. 122) with crank and flywheel are perhaps the best of that type in themarket, and whose single pumps of wall type are such favourites for feedingsmall boilers. Auxiliary pumps should have bronze water ends andfittings, the plungers or pistons packed with ebonite or woodite, the rod ofrolled bronze of best quality, for standing shock, and the valves small andnumerous so as to give the maximum amount of perimetrical openingwith small lift; they also must be made of a bronze that will withstandcontinuous shock, and, by preference, machined from rolled or forged rod. Injectors for feeding marine boilers have not so far been looked on with 346 MANUAL OP MARINE ENGINEERING. favour; why, is not apparent, for they return to the boiler all the steariithey take, and consequently their efficiency is high, and they certainly areconvenient and easy to use for supplying sea-water or cold water fromreserve Fig. 124. Water Service.—An arrangement of water service is made in every ship,so that water can be applied to all bearings and slides, and also that a hosemay be used in case of fire or any other emergency. This generally consists EXPANSION JOINTS. 347 of a main pipe from a sea-cock leadinc; into a conveniont position, andhaving branches with a stand-pipe and brackets at each main bearing,crank-pin, and group of eccentrics. The water for the tunnel-bearings andthrust-beaiing is usually taken from the inside of the stern-tube, therebyserving the additional purpose of circulation in the tube.
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