144
THE HONGKONG GOVERNMENT GAZETTE, MARCH 11, 1910
190.
What is the composition of nickel-steel? Where is it sometimes used in engines and boilers?
191.
How is forced draught generated on board ship and supplied to boiler-furnaces? the air heated before delivery? If so, how?
192.
What is "induced" draught? Compare the merits of "forced" and of "induced draughts.
193.
Is
19
How is the intensity of forced or induced draught measured? What is the usual pressure employed in the inercantile marine?
194.
An explosive gas is liberated from bunker coal. Usually in well ventilated bunkers this gas escapes into the atmosphere without doing harm. In ill-ventilated bunkers the gas after mixing with a certain proportion of common air has been known to explode when a naked light has been brought into contact with it. What is the composition of the gas ? Where is it found, in bunkers, 'tween decks, pockets, and coal shoots? How may it be got rid of as soon as it evolves from the coal? How many cubic feet of air to on of the gas forms a violent explosive mixture?
195.
A lighted lamp or candle has sometimes been lowerei into an apparently empty paraffin tank and produced an explosion resulting in injury to the person holding the light. What did the tank probably contain, and what produced the explosion?
196.
In vessels carrying coal-cargoes it has been observed that, generally speaking, the gas which escapes from the body of the coal is found more abundantly at the forward end of the hold than at the after end. Why should this be so?
197.
In recently opened ballast tanks, double-bottoms, and boilers, a light lowered into either has sometimes been extinguished. What would, in all probability, cause this?
198.
In double-bottom steamers where does the bilge water lie, and where are the roses of the bilge pipes fitted?
199.
What is the advantage of a large rose over a small one?
200.
Why, especially in vessels carrying cargoes liable to shift, should engine bilge suctions be fitted to both wings of the bilge?
201.
In a heavily listed vessel, why is it difficult to keep steam?
202.
If the engine pumps got choked and water accumulates in the stokehold bilges, what effect does the water have upon the bilge boards and stokehold plates, when the ship is rolling violently?
203.
In a triple expansion engine, what spare gear do you consider necessary in the case of a foreign-going ship? Also what stores would you provide for a voyage to New Zealand ?
204.
What means are sometimes provided for temporarily coupling together the broken parts of, say, a tunnel-shaft? Describe the fitting.
205.
Does the pressure on the thrust-collars vary with the horse-power, or with the speed of the ship, or how?
206.
If the holding-down bolts of a thrust-bearing should become slack, what effect would it have upon the working of the engines?
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