Agricultural Education — Examination Papers, 1871. Ixxxiii 
on it will probably bo fonnd tbat moisture is deposited on tbe inside 
of the walls of the room. Why is this so ? 
8. If the jiiston of a steam-engine is 2 feet in diameter and makes 
20 strokes per minute, each 3 feet long ; what must be the mean pres- 
sure of the steam per sq^uare inch if the engine work at the rate of 
20-horso power ? 
9. Describe the piece of mechanism in an ordinary double-acting 
steam-engine, called " the parallel motion." And state what end it is 
designed to answer. 
EXAMINATION IN MENSUEATION AND LAND 
SUEVEYING. 
[Maximum Numbee of Marks, 100. Pass Number, 50. 
Thursday, April 20th, from 2 p.m. till 5 p.m. 
1. State the rule for finding the area of a triangle : (a) when the 
base and perpendicular are known, (b) when the three sides are 
known. Find the number of square feet in a triangular area whose 
sides are 3,501, 3,607, and 3,598 feet respectively. 
2. State what is the relation between the circumference and dia- 
meter of a circle. 
A block of wood is a perfect cylinder, and is found to be 127 inches 
in circumference, (a) find the diameter of the block, (b) "When the 
block is cut square what is the length of one side of the square end ? 
3. The diameter of the bore of a cast-iron pipe is 4 inches, the 
thickness of the metal 1 inch. Given that the specific gravity of the 
metal is 7-2, find the weight of the pipe per foot. 
4. State the steps by which you would find the centre of a circular 
grass plot, if you had pickets and ropes only. 
5. Let ABCD be a rectangular piece of ground, and a point F is 
taken anywhere in the side AB, show how to draw through F a line, 
to a point in the opposite side CD, which shall divide the rectangle 
into two parts such that the area of one is twice that of the other. 
6. Plot the following notes, and assuming that the first station is 
9 feet above the level of a pond, find how much the last station is 
above the level of the same pond. 
DISTANCE. 
BACK-SIGHT. 
FOHE-SIGI1T. 
100 
3-75 
6-81 
200 
3-51 
5-G8 
350 
8-03 
1-09 
110 
2-74 
7-35 
172 
6-91 
5-38 
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