Removing scale.—How is scale removed in boilers? [II. 454].
Salinometer.—What is a salinometer? [II. 455].
Salt in sea water.—About how much salt does sea water contain? [II. 454].
Division plates.—What are division plates in boilers? [II. 455].
Intercepter.—What is the separator or intercepter of a marine boiler? [II. 455].
Boiler draft.—What causes the draft in a boiler? [II. 455].
Rapid wasting.—Where does the most rapid wasting occur in marine boilers? [II. 455].
Coal consumption.—About how much coal is consumed per square foot of grate in marine boilers? [II. 455].
Short of coal at sea.—If at sea and short of coal, what course would you pursue in order to save coal and get into port? [II. 455].
Boiler relief in extreme danger.—How would you relieve a marine boiler in case of the safety valve being locked down from some accidental cause, the engine also being disabled? [II. 455].