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 give the best results in a condensing engine?
A. Usually considered 25.
Q. What is meant by a horizontal tandem engine?
A. One cylinder being behind the other with two pistons on same rod.
Q. What is a Corliss valve gear?
A. (Describe the half moon or crab claw gear, or oval arm gear with dash pots.)
Q. From what cause do belts have the power to drive shafting?
A. By friction or cohesion.
Q. What do you understand by lap?