140
THE HONGKONG GOVERNMENT GAZETTE, MARCH 11, 1910.
119.
What are the small cylinders sometimes fitted on the slide valve casing cover of vertical engines? Explain their action. To what are they connected by a pipe? Why so?
120.
Name the principal pipes in connection with the engines and boilers of a steamer, and state to what the ends of these pipes are connected?
121.
Through what cocks or valves, pipes and chambers does the water pass on its way from the sea inlet rose plate to the water space of the boiler, with a jet condenser ?
122.
Through what cocks or valves, pipes and chambers does the circulating water of a surface condenser pass?
123.
Through what cocks or valves, pipes and chambers does the steam pass from the boiler until it is in the form of water in the hot well?
124.
Name the pieces of the engine through which the pressure of the steam is transmitted from the piston to the screw propeller. Name them in the order in which they act.
125.
What is an air vessel? How does it act? At what parts of an engine or of its fittings are air vessels generally applied?
126.
What is the construction of a mudbox? Where should mudboxes be placed? Why are they necessary? How should the space be divided by the rose plate, and why?
127.
What is a trunk engine? Why has it fallen into disuse?
128.
What is an oscillating engine? For what steamers are oscillating engines generally adopted? Why? How is the steam conveyed to and from the slide valve casing?
129.
Of what parts does the valve motion gear of an oscillating engine consist ?
130.
For what have geared engines sometimes been used? Of what were the cogs of the large wheel made ?
131.
At what part of a screw steamer is the pressure that propels it applied to the hull ?
132.
At what part of a paddle steamer is the pressure that propels it applied to the hull ?
133.
About how much fuel per indicated horse-power per hour is required by modern steam engines. common, compound, and triple expansion ?
134.
What is the explanation of the economy of the surface condenser ?
135.
What is the construction of a surface condenser? Of what are its tubes made? How are they fixed? How are they kept tight? What is done with a split tube?
136.
Where do surface condensers foul? How are they cleaned?
137.
What non-conducting substances are employed to prevent radiation, and how are they applied?
M.
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