Ixxxviii AyricuUural Education — Examination Papers, 1872 
each from a depth of 100 feet in the course of a working day ; what 
portion of his working power has been expended on the friction of the 
machinery ? 
5. A body weighing twelve tons is moved along a smooth horizontal 
])lane by a constant horizontal force, and is found at the end of 
4 seconds to be moving at the rate cf 5 feet per second : what is the 
amount of that force ? If the plane had been rough and this force 
had just not moved the body, what would have been the co-efficient of 
friction between the plane and the body (g = 32-2) ? 
6. A ball weighing 1 cwt. is fastened to the end of a rod ; the rod 
is horizontal and at the other end is attached a vertical spindle ; the 
distance from the spindle to the centre of the ball is 8 feet. If the 
ball makes 80 revolutions per minute, what force does it exert on 
the spindle ? In what units do you estimate the result ? 
7. What is meant by the " dead points " of a crank ? Explain how 
the fly-wheel tends to equalize the motion of machinery. 
8. Explain the method of finding the specific gravity of a liquid by 
ascertaining the loss of weight of a given substance when immersed in 
the liquid. Give a numerical example. 
9. Describe briefly the effects produced by the application of heat 
to a liquid. What is meant by a saturated vapour ? 
EXAMINATION IN MENSIURATION AND LAND 
SUEVEYING. 
Maximum Number of Marks, 100. Pass Number, 50. 
Thursday, April 18tli,from 2 p.m. till 5 p.m. 
1. A common hipped roof is 30 feet wide and 50 feet long, the 
height of the ridge above the eaves is 10 feet ; how many squares of 
slate are there in the roof? 
2. Draw on your paper a figure with four unequal sides ; construct 
a triangle equal in area to this figure, and then construct a square 
equal in area to the triangle. 
3. Give a rule for finding the solid contents of a piece of rcfugh or 
unsquared timber, and give a numerical example. Mention briefly 
the reason of the rule you give. 
4. It is said that 50 cubic feet of dry oak weigh 25 cwts. In this 
rule what is the assumed value of the specific gravity of dry oak ? 
5. A well is 5 feet in diameter and 50 feet deep ; how many cubic 
feet of earth have been dug out in making it ? 
G. There are two poles, one on each side of a pond ; bath are acces- 
