THE NUMBER OF BRICKS AND QUANTITY OF BRICKWORK IN WELLS FOR EACH FOOT IN DEPTH. (Hurst.) ------+------------------------------+------------------------------ | HALF-BRICK THICK. | ONE BRICK THICK. +-----------------+------------+-----------------+------------ |Number of Bricks.| |Number of Bricks.| +------+----------+ Cubic Feet +------+----------+ Cubic Feet | Laid | Laid in | of | Laid | Laid in | of | Dry. | Mortar. | Brickwork. | Dry. | Mortar. | Brickwork. ------+------+----------+------------+------+----------+------------ 1·0 | 28 | 23 | 1·6198 | 70 | 58 | 4·1233 1·3 | 33 | 27 | 1·8145 | 80 | 66 | 4·7124 1·6 | 38 | 31 | 2·2089 | 90 | 74 | 5·3015 1·9 | 43 | 35 | 2·7979 | 112 | 92 | 6·4795 2·3 | 53 | 44 | 3·0926 | 122 | 100 | 7·0686 2·6 | 58 | 48 | 3·3870 | 132 | 108 | 7·6577 3·0 | 68 | 57 | 3·9760 | 154 | 126 | 8·8357 3·6 | 79 | 65 | 4·5651 | 174 | 142 | 10·0139 4·0 | 89 | 73 | 5·1541 | 194 | 159 | 11·1919 4·6 | 100 | 82 | 5·7432 | 214 | 176 | 12·3701 5·0 | 110 | 90 | 6·3322 | 234 | 192 | 13·5481 5·6 | 120 | 98 | 6·9213 | 254 | 209 | 14·7263 6·0 | 130 | 107 | 7·5103 | 276 | 226 | 15·9043 6·6 | 140 | 115 | 8·0994 | 296 | 242 | 17·0825 7·0 | 150 | 123 | 8·6884 | 316 | 260 | 18·2605 7·6 | 160 | 131 | 9·2775 | 336 | 276 | 19·4387 8·0 | 170 | 140 | 9·8665 | 358 | 292 | 20·6167 8·6 | 180 | 148 | 10·4556 | 378 | 308 | 21·7949 9·0 | 191 | 156 | 11·0446 | 398 | 326 | 22·9729 10·0 | 212 | 174 | 12·2227 | 438 | 360 | 25·3291 ------+------+----------+------------+------+----------+------------ Good bricks are characterized as being regular in shape, with plane parallel surfaces, and sharp right-angles; clear ringing sound when struck, a compact uniform structure when broken, and freedom from air-bubbles and cracks. They should not absorb more than one-fifteenth of their weight in water. After making liberal allowance for waste, 9 bricks will build a square foot 9 inches thick, or 900, 100 square feet, or say 2880 to the rood of 9-inch work, which gives the simple rule of 80 bricks = a square yard of 9-inch work. The resistance to crushing is from 1200 to 4500 lb. a square inch; the resistance to fracture, from 600 to 2500 lb. a square inch; tensile strength, 275 lb. a square inch; weight, in mortar, 175 lb. a cubic foot; in cement, 125 lb. a cubic foot. Compressed bricks are much heavier, and consequently proportionately stronger, than those of ordinary make. STORING WELL-WATER.