13. Q. What is meant by working steam expansively?

A. Hooking the reverse lever up toward the center gives the valve a

shorter travel and closes the live steam port when the piston has made

only a part of its stroke. This cuts off the supply of live steam coming

from the steam chest. The expansion of the steam already in the cylinder

pushes the piston to the end of its stroke without the use of a full

cylinder of live steam.