1 Jay., 1899.] QUEENSLAND AGRICULTURAL JOURNAL. 19 
EXAMPLE. 
Required the solid content of acircular stack, the girth at the bottom being 
56 feet, the girth at the eaves 63 feet, the perpendicular height from the ground 
to the eaves 12 feet, and the perpendicular height from the eaves to the crown 
of the stack 9 feet. 
Conrenr or tHe Lower Portion or THE SrAck,. 
Add together the two girths, 56 and 63 = 119, half of which is 595 feet— 
the mean girth. 
Square this mean girth, and we have-— 
59°5 x 59°5 = 3,540:25, which is the area of the base. 
Now wultiply this area by 10, and divide by 125 (or multiply by ‘08, or 
roughly by +)— 
3,540°25 x 10 = 35,402°5 35,402'5 + 125 = 283:2. 
Multiply this by the height of the stack (12 feet)— 
283:2 x 12 = 3,898'4 cubic feet ; 
which, reduced to cubic yards (27 cubic feet = 1 cubic yard), gives us 125 
cubic yards as the solid content of the lower portion of the stack. 
We now have to calculate 
THe ConrENT OF THE Roor. 
Square the girth at the eaves (63 feet)— 
63 x 63 = 3,969. 
Multiply by Llo— . 
3,969 x 10 = 39,690. 
Divide by 125— 
39,690 + 125 = 317°52. 
Multiply by 4 of the perpendicular height of the roof (9 feet): 5 of 9=38. 
Then, 817°52 x 8 = 85:28 cubic yards. 
Thus the whole stack is shown to contain— 
In the lower portion ... 6 ... 125 cubic yards 
WP gy hs ie 43 385+ about 
160% cubic yards. 
TO CALCULATE THE CONTENT OF AN OBLONG STACK. 
Suppose our stack to have the following dimensions:—Length, 50 feet; 
breadth at the eaves, 17 feet; at the bottom, 12 feet; perpendicular height 
from the ground to the eaves, 18 feet; and from the eaves to the ridge of the 
stack, 7 feet. The following calculation will give the content in cubic feet :— 
Get the mean breadth by adding together the breadth at the eaves and the 
breadth at the base, and divide by 2, ‘That is— 
G 
Mp ae AB ee = 14:5, the mean breadth. 
: 2 ~~ 2 
Multiply by the vertical height (18 feet) :— 
145 x 13 = 188°5 square feet, area of lower portion. 
_ For the roof, multiply the breadth at base of eaves by half the perpen- 
dicular height from eaves to ridge. , 
17 x 3:5 = 59:5 square feet, area of roof. 
Add the two areas together, and multiply by the length of the stack, 
and we get the cubic content-as follows :— 
188°5 + 595 = 248 x 50 = 12,400 cubic feet, 
