Junior Examination Papers , 1894 . 763 
A body weighs 12 lb. in vacuo and 8 lb. 12 oz. in water; what is its spe- 
cific gravity ? 
A body, whose specific gravity is 6, weighs 10 lb. ; it is tied to a piece of 
wood, whose specific gravity is 0'84, and just sinks it ; what is the weight of 
the piece of wood ? 
8. Describe a barometer. 
What does a barometer measure 1 
What effect would be produced if a hole were made in the longer branch 
of a barometer-tube ? And what, if the hole were made in the shorter branch ? 
9. Explain what is meant by air being saturated with vapour. 
If saturated air is inclosed in (say) a glass vessel at a temperature of 60°, 
what will be the effect of taking the vessel into a room where the tempera- 
ture is (say) 40° 1 And what of taking it into a room where the temperature 
is (say) 80° ? 
If there are no fires in a house, why do the walls commonly get damp when 
a thaw comes ? 
10. Describe the contrivance called a “parallel motion,” and explain how 
it is applied in the ordinary stationary steam engine, and in what way it is 
useful. 
EXAMINATION IN MENSURATION AND LAND SURVEYING. 
Maximum Number op Marks, 100. Pass Number, 40. 
Wednesday, November 14, 1894. 
( Two hours allowed.') 
1. A side of a triangle is 920 ft. long ; the angle opposite to the side is 
48°, and the angle at one end of the side is 57° ; draw the triangle to the 
scale of 1 inch equal to 180 ft., note the lengths of the other two sides, and 
find the area of the triangle. 
2. Of two rectangular areas one is 500 ft. long by 60 ft. wide, the other 
is 1,200 ft. long by 700 ft. wide; find (a) the ratio of the larger area to the 
smaller, ( b ) the larger area in acres, with the odd roods and poles. 
3. There is a long pond or canal ; 500,000 cubic feet of water flow into it 
daily, over a cascade at one end ; and in like manner the same number of 
cubic feet flow out daily at the other end ; the cross section of the water in 
the canal, near the middle, is triangular, the width of the water being 80 ft. 
and the greatest depth 5 ft. ; with what velocity— say, in feet per minute — 
does the water flow through this section 7 
4. A circle is 150 ft. in diameter; find its area to the nearest tenth o‘f a 
square foot by taking 31 4159 as the value of ir. 
If were taken as the value of tt, what would be the error in the area to 
the nearest square foot ? 
5. A plan or map is drawn to the scale of 16 in. equal to one mile, what 
area in acres is represented by a square inch on the plan ? 
Draw a square which would represent on the plan an area of 20 acres, 
C. A, B, C, D, E, F, G, are points in succession along a road ; their 
distances from A are successively 0, 270, 510, 810, 1060, 1300, 1620 ft. ; a 
levelling staff is placed successively at the points A, B, Ac., and the readings 
of the level are as follows: between A and B, backsight 11-3, foresight, 2 5; 
between B and C, backsight 10 8, foresight 4 8 ; between C and D, backsight 
12-1, foresight 41 ; between D and E, backsight 6 5, foresight 2-7 ; between 
E and F, backsight 31, foresight 7 - 9 ; between F and G, backsight 4-7, fore- 
sight 7-8. Arrange these data in the form of entries in a field-book, and 
draw a section of the road, taking the point A to be 70 ft. above the datum 
line, and using a vertical scale of 2 in. equal to 100 ft., and a horizontal 
scale of 1 in. equal to 300 ft. 
