Q. Why does condensing the used steam form a vacuum?
A. Because a cubic foot of steam at atmospheric pressure shrinks into about one cubic inch of water.
Q. What is a condenser as applied to an engine?
A. The condenser is that part of an engine into which the exhaust steam enters and is condensed.
Q. About how much gain is there by using the condenser?
A. Seventeen to twenty-five per cent. where cost of water is not figured.
Q. What do you understand by the use of steam expansively?
A. Where steam admitted at a certain pressure is cut off and allowed to expand to a lower pressure.
Q. How many inches of vacuum gives the best result in a condensing engine?
A. About 25 inches.