Steam Boilers, Engines, Nozzles and Turbines
The function of a piston rod is

To exhaust steam from the cylinder at proper moment
To transfer motion from the piston to the cross head
To convert heat energy of the steam into mechanical work
To guide motion of the piston rod and to prevent it from bending

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Steam Boilers, Engines, Nozzles and Turbines
In cross compounding, the cylinders are arranged

Side by side and each cylinder has separate piston, connecting rod and crank
Side by side and each cylinder has common piston, connecting rod and crank
At 90° and each cylinder has common piston, connecting rod and crank
At 90° and each cylinder has separate piston, connecting rod and crank

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