134
THE HONGKONG GOVERNMENT GAZETTE, MARCH 11, 1910.
9.
What are the different properties of cast iron, of wrought iron, and of steel?
10.
What is meant by the terms "breaking stress", "proof stress ", "safe working stress"?
11.
What is the cohesive strength, or breaking stress, of good ordinary wrought iron?
12.
Tempering steel; how is it done, and in what order do the colours come ?
What is case-hardening?
13.
14..
Which of the common metals or alloys can be forged, and which of them are brittle or "short"?
15.
What is meant by "welding"? Which of the common metals can be welded ?
16.
The expansion of metals by heat; give examples of this in the engine and in the boiler.
17.
In the construction of steel cylindrical marine boilers for what parts have the plates to be worked hot? What precautionary treatment of these plates is afterwards necessary?
18.
In what parts of cylindrical marine boilers is the strongest riveting employed? In which of the shell seams is it most necessary?
19.
What is "caulking", and how are seams prepared for caulking?
20.
Describe the different way of fastening the ends of the main stays of a boiler. What are the merits of, or objections to, the different plans?
21.
What stress per square inch is allowed on boiler stays?
22.
Describe a riveted stay, and state where such stays are commonly used.
23.
Where are thin plates to be looked for in a boiler as it wears, and how is the thinness to be detected ?
24.
How are boiler tubes fixed ? What are "stay tubes", and how are they secured ?
25.
Where is it generally that boiler tubes leak ? the causes of this leaking?
26.
What are the causes of cracked tube plates ?
are they repaired ?
4:
27.
How is this defect repaired? What are
Where are the cracks situated? How
What is the difference between a dry uptake" and a "wet up-take"? Which requires more repair? Why? Where have you seen a wet uptake?
28.
What is a superheater? What is its construction?
What valves are on it? There
is sometimes a gauge glass on it; what is that for? Are superheaters now in general use ?
29.
What parts of a marine multitubular boiler are first injured by shortness of water?
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