Steam Boilers, Engines, Nozzles and Turbines
The cylinder dimensions of a compound engine may be designed on the basis of

Equal power developed in each cylinder for uniform turning moment
Equal initial piston loads on all pistons for obtaining same size of piston rod, connecting rod etc. for all cylinders
Equal temperature drop in each cylinder for economy of steam
All of these

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Steam Boilers, Engines, Nozzles and Turbines
Equivalent evaporation of water is the evaporation for a feed water supply at 100°C

Conversion into steam at the same pressure at which feed water is supplied
And its corresponding conversion into dry saturated steam at 100°C and 1.033 kg/cm²
Conversion into steam at atmospheric condition
And its corresponding conversion into dry steam at desired boiler pressure

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