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CHAPTER VIII-CALCULATIONS BEGARDING EXCAVATIONS. 271
544. The bottom (breadth) and the top (breadth) are (each) doubled. To these are added (respectively) the top (breadth) and the bottom (breadth). The resulting) quantities aro (rospootively) inoreased and decreased by the height (above the ground) of the unbroken (part of the wall); and (then the quantities so obtained) are multiplied by the length and also by the sixth part of the (totalt height. . (Thus) the number of bricks intact and the number of bricks fallen off may be ubtained in order.
Examples in illustration thereof. 551. This high fort-wall (of measurements already given, struck by 8 oy olonic wind) bas been (obliquely) from the bottom, broken down along the diagonal section. In relation thereto, how mans are the bricks intact and the bricks fullen down
561. The same high fort-wall has been broken down by the cyclone obliquely after leaving over 1 hasta from the bottom. How many are the bricks that remain intact and how many the bricks that have fallen down?
The rule for arriving at the growing number of layers (of brioks) in relation to the central height of a fort-wall, and (algo) for arriving at the rate of the) diminution of layers
54. If a be the breadth at the bottom, b the breadth at the top, h the total
1 height and the
length of the wall, and a the height above the ground of the unbroken part of the wall then 12a + 0
+ d), and (20
+ a-d) represent the vumber of bricks intact and the number of brick. fallen
12
oft.
The Bgare in the purio shows the wall mentioned in Atanen 68), and ABCD adlante the plane along which the wall fractured when it broker
