Breaking of tubes.—What is the commonest cause of boiler tubes breaking? [II. 452].
Split tube.—How is a split tube stopped up? [II. 452].
Uptake.—What is the uptake of a marine boiler? What is a wet uptake? [II. 453].
Superheater.—What is the superheater of a marine boiler? [II. 453].
Fittings.—What fittings are essential to a marine boiler? [II. 453].
Safety valves.—What is a dead-weight safety valve? What is a spring-loaded safety valve? What is a lock-up safety valve? [II. 453].
Test cocks.—What do the three boiler test cocks show? How are boiler test cocks cleaned? [II. 453].
Steam gauges.—What is a gauge glass or water-gauge glass? What is a Bourdon dial gauge? What pressure is shown by a boiler steam gauge? [II. 453].
Scum cocks.—- How many scum cocks are used in a marine boiler? [II. 454].
Sluice valves.—What are sluice valves in steamships? [II. 454].