18. Q. Is it important that air be pumped up on a two-cylinder compound
before the engine is moved? Why?

A. Yes. Because the separate exhaust valve is opened by air pressure and
the engine cannot be simpled without sufficient pressure.

19. Q. How are the blows in a compound located?

A. The same as in a simple engine with the exception that any blow on
the high-pressure side will not be heard when the separate exhaust valve
is closed. A blow on the high-pressure side will increase the pressure
in the low-pressure side, so relief valves will pop on low-pressure side
when working compound with full throttle.

20. Q. What should be done if high-pressure piston of a cross compound
is broken off the rod, or if the high-pressure or low-pressure cylinder
head is broken?

A. Cover the ports on that side, open separate exhaust valve and run in;
use live steam in low-pressure cylinder only, for the broken piston.
With broken cylinder head, would cover ports on that side. Open separate
exhaust and run in with low-pressure side. Would not take down main rod,
but would take out pop valves in both cylinder heads and see that the
cylinder is properly oiled. For low-pressure head broken, would cover
ports on that side, open separate exhaust valve and use high-pressure
side; need not take down main rod, but would see that the cylinder is
well oiled.

21. Q. In the event of separate exhaust valves failing to work when
throttle is wide open, what can be done to assist in opening?