Examples. 1. What is the cost of enclosing, with a stone wall, 10 ft. high, and 1 ft. thick, an acre of ground, in the form of a square, at $21 per perch of 22 cubic feet? Then, by the Rule, 5045 10 × 11 ÷ 221 :- -Or 5045X10X25045-560,5 perches. 6 5045, Or thus, 5.045 X 10-5045560,5 P., content: then 560,52 140,138 x 10 = $1401,38 required cost. $1401,39, the 2. Required the cost, at the same rate, of enclosing with a wall, similar to the above, a square lot containing 100 acres. Ans. $13914,02+. 612. Bricks are generally sold and laid by the thousand. The thickness of a brick, allowance being made for cement, is about 2 inches, and its width half its length, the latter being usually considered about 9 inches. This length, or rather its half, is the unit for measuring the thickness of brick walls: thus a wall is said to be 41 in., 9 in., 13 in., 18 in., 22 in., &c., according to the number of half-lengths of brick which it contains: hence we say that a 9-inch wall is one brick thick; a 13-inch wall, 1 bricks; an 18-inch wall, 2 bricks thick, &c. To find the content of brick-work. The number of bricks used in building a wall is found by counting the number of courses and the number of bricks in each course. Builders and jobbers, however, in making estimates, as well as in finding the content of their work, frequently use the following Rule:-Find the superficies of the wall in square feet and multiply it by 14 for every length of brick in the thickness. Examples. 1. How many bricks will be required to build an 18-inch wall, 16 ft. high, round a garden, containing 21 acres, in the form of a square, and what will it cost at the rate of $41 per thousand? Ans. 594048 bricks, and the cost $2672,216. 2. The other conditions being as above, how many bricks will be required and what will be the cost, supposing the length of the garden equal to twice its breadth? Ans. 629920 bricks, and tae cost $2834,64. For circular work. 613. Take the diameter of the outer circle in feet, multiply by 31416, and that product by the depth or height, taken also in feet, which will give the surface of the curb or wall in square feet. Then multiply this area by 7 for every half-length of brick in the thickness. Examples. 1. How many bricks are required to build the wall of a circular cistern 10 ft. in diameter and 12 feet deep, the wall being 13 in.? 3,1416 × 10 × 12=376,992, outer surface of wall; then, 376,992 X 217916,832 or 7917, Answer. 2. How many bricks are there in a 4-in. curb, the diameter of which is 5 ft. and the depth 30 ft.? Ans. 3298,68 or 3299. 0,000000 0,477121 0,698970 25 7 0,845098 8 0,903090 1,000000 30 11 1,041393 31 12 1,079181 32 1,146128 34 15 1,176091 35 1,544068 17 1,230449 18 1,255273 38 1,579784 1,491362 1,113913 33 1,518514 19 1,278754 39 1,591065 59 1,770852 79 1,897627 1,322219 41 1,612784 61 1,785330 1,342423 42 1,623249 0,602060 24 1,380211 44 1,643453 64 1,806180 84 1,397940 45 1,653213 65 0,778151 26 1,414973 46 1.662758 66 1,819544 1,681241 9 0,954243 29 1,462338 49 1,690196 69 1,838849 1,477121 50 1,698970 70 1,845098 90 51 1,707570 71 1,531479 54 1,732394 74 1,869232 94 16 1,204120 36 1,556302 56 1,748188 76 1,880814 96 1,568202 57 1,755875 77 1,886491 97 20 1,301030 40 1,602060 60 1,778151 80 1,903090 100 62 1,792392 63 1,799341 83 1,812913 68 1,832509 1,851258 1,716003 72 1,857332 92 73 1,863323 1,740363 75 1,875061 95 1,977724 78 1,892095 No. Log. 1,908485 1,913814 1.919078 1,924279 1,929419 1,934498 1,939519 1,944483 1,949390 1,954243 1,959041 1,963788 1,968483 1,973128 1,982271 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