Acp-icultural Education — Examination Papers, 1879. cxlix 
liold is 1050 grains ; if it is capable of holding 910 grains of anotlier 
liquid, what is the specific gravity of that liquid ? 
7. Explain the action of a common siphon, and why water can he 
<lrawn off only to a lower level by means of it. 
8. What are the freezing and boiling points of a Thermometer, and 
by what means arc they determined ? How are the scales on Fah- 
renheit's and the Centigrade thermometer graduated ? When Fahren- 
heit's thermometer reads 158°, what should the reading of the Centi- 
grade thermometer be ? 
9. What is the condenser of an ordinary stationary steam-engine, 
and what is its use ? If the condenser acted imperfectly, what effect 
would this have on the power of the steam-engine ? 
EXAMINATION IN MENSURATION AND 
SURVEYING. 
Maximum Number of Mauks, 100. Pass Number, 50. 
Thursday, April 10th, from 2 p.m. till 5 p.m. 
1. State the rules or formula for finding the circumference and area 
of a circle, in terms of its radius. 
The circumference of a circle is found by measurement to be 
12 feet ; what is its area ? 
2. Given that a brick measures 9 inches by 4 J inches by 3 inches; 
calculate the number of bricks in a pile 24 feet long, 15 feet wide, and 
6 feet high. 
3. A ditch is cut 10 feet wide at top, 4 feet deep, and with sides 
sloping at the rate of two vertical to one horizontal ; how many cubic 
yards of earth are moved in making 450 feet of the length of the 
ditch ? 
4. The horizontal plan of a piece of land is a square, with a side of 
100 feet ; two of the sides of the land are horizontal, and, reckoning 
vertically, one is 10 feet above the other ; the ground is to be levelled 
by digging out earth from the higher and heaping it so as to raise 
the lower part ; assuming that the earth on all sides, both of cutting 
and embankment, is at a uniform slope of one vertical to one hori- 
zontal, draw a plan of tlie horizontal surface of the ground thus 
obtained, and calculate its area. 
5. It is found that two points on a plan are an inch apart ; it is 
