. A manual of marine engineering: comprising the design, construction, and working of marine machinery. No. Sets of No. Sets of Valve-Gear. Fie Arrangements of the Cylinders of Quadruple-Expansion^ Two-, Three-, and Four-Crank Engines. QUADRUPLE-EXPANSION ENGINES. 103 claimed, apart from space occupied, that the two-crank quadruple is so goodan engine from the mechanical point of view as the three-crank triple; andalthough it is claimed that this form of quadruple consumes less coal per hour than a corresponding triple engine with three cranks, i
. A manual of marine engineering: comprising the design, construction, and working of marine machinery. No. Sets of No. Sets of Valve-Gear. Fie Arrangements of the Cylinders of Quadruple-Expansion^ Two-, Three-, and Four-Crank Engines. QUADRUPLE-EXPANSION ENGINES. 103 claimed, apart from space occupied, that the two-crank quadruple is so goodan engine from the mechanical point of view as the three-crank triple; andalthough it is claimed that this form of quadruple consumes less coal per hour than a corresponding triple engine with three cranks, it isvery doubtful if its mechanical efficiency is so high, or the consumption pervoyage in similar ships is materially less. For the same power the low-pressure cylinder of each engine will be practically the same size, especiallyif economy of fuel is to enter into consideration. The fourth cylinderwith its piston, valves, &c., will cause a distinct addition to the resistance ofthe engine and a consequent loss of useful work. The objections to increasedboiler pressure hold good in this as in other cases, so that losses in pra
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