Agricultural Education — Examination Papers, 1870. cxiii 
A bottle is 6 inches liigli, aud has a base of 4 square inches, a 
straight tube 0'25 square inches in section is fitted to its neck. The 
whole is filled witli water. Assuming that a cubic foot of water 
weighs 996 oz., find the length of the tube if the pressure on the 
bottom of the bottle is 83 oz., and the weight of the water which 
produces this pressure. 
5. What is meant by the specific gravity of a solid or liquid? A 
solid weighs 30 oz. in vacuo, 19 oz. in water, and 20 oz. in a certain 
spirit. What is the specific gravity of the spirit ? 
6. Describe briefly the siphon. Explain wliy the legs must be of 
unequal length, and which must be the longer ? 
7. What is meant by " Centrifugal force ? " 
A body weighs 15 lbs. ; it is tied to the end of a string 3 feet long, 
and is caused to describe a circle (whose radius is the string), 
imiformly 120 times a minute. What is the tension of the string 
((7 = 32). If the sti-ing woidd just break under a tension of 50 lbs., 
what is the greatest velocity with which the body can move in the 
circle ? 
8. Describe briefly the Governor of the Steam-engine, and show by 
a diagram how it is made to " govern " the motion of the engine. 
9. If the piston of a steam-engine 16 horse-power has a diameter 
of 2 feet, and stroke of 3-| feet, and is worked by a mean net 
pressure of 1 2 lbs. per square inch, how many strokes does it make 
per minute ? 
10. State briefly what is meant by specific heat, and what by latent 
heat. 
If, first, a pound of water at 32^ F. (0° C.) and a pound of water at 
212° F. (IOC C.) are mixed, and secondly, if a pound of ice at 32° F. 
(0° C.) and a pound of water at 212° F. (100° C.) are mixed; state 
the results in these two cases, and explain the bearing of these facts 
on the question of the latency or disappearance of heat. 
EXAMINATION IN MENSUEATION AND LAND 
SURVEYING. 
MAXIMUM NUMBER OF MARKS, 100. PASS NUMBER, 50. 
Thursday, April 2Sth,from 2 p.m. till 5 p.m. 
1. What is the rule for determining the area of a circle ? Write 
down to five places of decimals the niunber commonly denoted by tt; 
if this number be taken to equal 3i, would the area determined be 
greater or less than the true result ? A carriage drive round a 
circular grass plot is 12 feet wide, and covers a quarter of an acre. 
What is the diameter of the grass plot ? 
2. What is a rod of brickwork? A square tower is 70 feet high, 
VOL. VI. — s.s. h 
