. A manual of marine engineering: comprising the design, construction, and working of marine machinery. Fig. 29.—Section through Cylinder. Fig. 29a.—Admiralty Method of Fitting Liners. usefulness, excepting that it does not admit of the piston working on itsteam-tight. If a liner is to be fitted, a little sponginess, or even a blow-hole,is of no consequence, and therefore the extra cost of fitting a liner does not,as a rule, exceed the reasonable premium which would be allowed forassuring good and sound castings; and this is especially so in the case of largecylinders. False Faces.—For the sam
. A manual of marine engineering: comprising the design, construction, and working of marine machinery. Fig. 29.—Section through Cylinder. Fig. 29a.—Admiralty Method of Fitting Liners. usefulness, excepting that it does not admit of the piston working on itsteam-tight. If a liner is to be fitted, a little sponginess, or even a blow-hole,is of no consequence, and therefore the extra cost of fitting a liner does not,as a rule, exceed the reasonable premium which would be allowed forassuring good and sound castings; and this is especially so in the case of largecylinders. False Faces.—For the same reason that liners are fitted to the cylinders,the cylinder face needs a false face. This is usually made of hard, close-grained cast-iron, of the same quality as the liner, and secured to the cylinder(fig. 29) by brass screws having cheese heads sunk in a recess, so as to be con- DOUBLE-PORTED VALVES. 143 siderably below the surface. Cai-e should bo taken to lock these screws, sothat they cannot slack back; the simplest way of doing this is to cut a slightnick in the side of the recess, an
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