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 part of the expansion and the turbine the last. From what we have said it will be apparent that this coalition of the reciprocating engine and turbine is a good one, because each works under favourable conditions. The reciprocating engine expands



Fig. 41. First set of Combination Machinery—in H.M.S. "Velox."

the steam to about atmospheric pressure, and the turbine carries on the expansion with high efficiency down to the pressure in the condenser. Now, though a large and high speed turbine can be made to deal with the high pressure portion of the expansion