:
THE HONGKONG GOVERNMENT GAZETTE, MARCH 11, 1910.
139
101.
Whereabout is the centre of the eccentric of a paddle wheel with feathering floats placed? In that case are the feathering levers on the striking face or on the back of the float? When the paddle shaft has an outer bearing how is the eccentric made?
102.
Of what materials are the working surfaces of a paddle wheel with feathering floats? How are they lubricated ?
103.
What is a "Disconnecting Paddle Engine"? At what place is the disconnecting effected ? How is it accomplished? In which of the cranks of a disconnecting engine are the crank pins fixed?
104.
Is link motion valve gear or the loose eccentric generally used for disconnecting paddle engines? For what steamers are disconnecting paddle engines frequently employed?
105.
What are expansion joints? Where are they necessary? require? Of what should the working surfaces be made?
106.
What attention do they
What omission in the construction of expansion joints may lead to a serious accident when steam is first applied? How is this prevented in the construction of a steam trunnion pipe for an oscillating engine?
107.
Describe an oil cup with a syphon worsted. How is the worsted arranged? How is it cleaned? How far down the tube does it extend?
108.
Describe a thrust bearing; which of the surfaces wears? Why are there sometimes a number of oil tubes for one thrust bearing?
109.
What parts of a screw shaft are generally covered with brass? Why is this necessary? About what thickness is the brass ?
110.
What is the stern tube or screw shaft pipe? Why is a pipe of such a length required ? Of what is it made ? How is it fixed at each end?
111.
What is a lignum vitæ bearing? How is the wood fitted?
generally used?
112.
Where is such a bearing
How is a screw propeller fixed on the shaft ? What means are used to prevent its getting loose at sea ?
Where are sluice valves placed? steamers? From what position should should it receive ?
113.
What large sluice valve is there in almost all screw this valve be worked? Why so? What attention
114.
With a condensing engine, what valves or cocks are on the skin of the ship in the engine room and in the stokehole?
115.
What are the necessary fittings of a marine boiler ?
116.
With a surface condensing engine; what cocks or valves are opened some time before the engine is started so as to be ready for starting whenever the order is given?
117.
What is a steam jacket? What cocks are on it? In what engines are jackets most generally used? Do they require to be felted?
118.
What parts of an engine or its fittings should be felted or otherwise protected from radiation ?