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Senior Examination Papers , 1893 . 
EXAMINATION IN AGRICULTURAL ENGINEERING. 
Maximum Numbeb of Mabics, 200. Pass Numbeb, 100. 
Tuesday, May 9th, from, 10 (i.m. till 1 p.m. 
N.B . — Not more than, half the questions should he attempted. 
1. A winch has a rope barrel 6 inches in diameter and a handle with a 15- 
inch length of arm. The wheel on the rope barrel is four times the diameter 
of the pinion on the handle shaft. Sketch the winch and calculate the ratio 
between the stress on the handle and the consequent pull on the rope. 
2. A cricket ball thrown vertically into the air is observed to be If seconds 
in falling from its highest position. Calculate the height to which it was 
thrown. 
3. A 9" x 3” deal 12 feet long spans an opening of 1 1 feet clear width. What 
load, hung on the centre of the deal, would break it ( a ) if placed on edge and 
(i) if laid on its flat ? A piece of the same deal, 1 inch square and 2 feet clear 
span, breaks under a load of 2 cwt. hung on its centre. 
4. Define what is meant by the term “ work,” and what are the units 
commonly used for measuring it. 
5. A coal truck weighing, when loaded, one ton, is hauled up an incline of 
1 vertical to 10 horizontal. Calculate the stress on the rope, and state what 
will be the work done a r ter the truck has been dragged up the incline 100 
feet measured horizontally. 
6. Describe the several changes which take place when 1 lb. of ice at 
32° F. is melted and wholly evaporated at standard atmospheric pressure. 
How many units of heat are required to effect the changes ? 
7. Explain the process of combustion, and state what is the cause of the 
heat evolved. 
8. What are the ordinary components of the atmosphere, and what bearing 
have they on plant and on animal life ? 
9. Explain why the barrel of an ordinary suction pump may not be placed 
more than a certain limited height above the water it has to suck up ; and 
calculate that height on the supposition that mercury is 13 6 times heavier than 
water. 
10. Sketch, to scale, the setting of an ordinary single-flue Cornish boiler 24 
feet longby 5' 6" diameter, with a 2' 9” flue. Write in the leading dimensions. 
11. Explain the advantage to be derived from using steam expansively, and 
show, by a diagram, what theoretical advantage is to be gained in a single- 
cylinder engine, cutting off at J the stroke, as compared with the same engine 
taking steam the whole length of the stroke. 
12. Describe the action of the Otto gas engine. 
13. Sketch a field gate 9 feet wide and 5 feet high, giving the scantlings of 
the timber which you wou'cl propose to use. 
14. Describe, in a general way, the construction and mode of operation of 
a reaping machine. 
15. Describe the contrivances used in an ordinary threshing machine for 
cleaning the grain and for separating it into qualities. 
1 6. Describe two or three methods of cooling milk rapi Jly for dairy purposes. 
17. Prepare a specification of a system of subsoil drains to drain a tract of 
ICO acres of land, having a slight natural slope to a stream which is available 
to take the drainage water. Make a sketch of your system. 
18. Describe the process of forging horse-shoes out of old worn shoes. 
