. A manual of marine engineering: comprising the design, construction, and working of marine machinery. No. 3. Four cranks, rods reduced. M\P \v\ 1 -^i No. 4. Four cranks, all rods same size. Fig. 22a.—Various Arrangements of the Cylinders of Triple-Expansion Engines. QUADRUPLE-EXPANSION ENGINES. 101 pressure cylinders, with the high-pressure cylinder over one, and the medium-over the other. These two latter plans, however, have the disadvantage offour cylinders as against three, with the corresponding number of valves andstuffing-boxes to absorb power. Plan No. 4, p. 99, shows the ar
. A manual of marine engineering: comprising the design, construction, and working of marine machinery. No. 3. Four cranks, rods reduced. M\P \v\ 1 -^i No. 4. Four cranks, all rods same size. Fig. 22a.—Various Arrangements of the Cylinders of Triple-Expansion Engines. QUADRUPLE-EXPANSION ENGINES. 101 pressure cylinders, with the high-pressure cylinder over one, and the medium-over the other. These two latter plans, however, have the disadvantage offour cylinders as against three, with the corresponding number of valves andstuffing-boxes to absorb power. Plan No. 4, p. 99, shows the arrangement of cyhnders in their naturalsequence for a three-crank engine, and is now most generally adopted. If thevalve-boxes are placed at the front or back of the engines, the cylinders may bemuch closer together, and a very symmetrical arrangement is got by placingthe low-pressure cylinder in the middle, while a little less space still is occu-pied by putting the high-pressure cylinder in the middle. Plan No. 2, p. 100, is an arrangement suitable for very large engineswhen it is necessary to have three low-pressure cylinders—in this case overeach
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