{ {| 60 Lingula Flags | 8000 { | | { CAMBRIAN | 61 Longmynd and Cambrian Rocks | 20,000 | | | | AZOIC. | | | | { METAMORPHIC {| Clay Slate, Mica-Schist. | { {| Gneiss, Quartz Rocks. | { | | { IGNEOUS | Granite. | { | | THE QUANTITY OF EXCAVATION IN WELLS FOR EACH FOOT IN DEPTH. (Hurst.) +-------------+---------------+ | Diameter of | | | Excavation. | Quantity. | +-------------+---------------+ | ft. in. | cubic yards. | | 3 0 | ·2618 | | 3 3 | ·3072 | | 3 6 | ·3563 | | 3 9 | ·4091 | | 4 0 | ·4654 | | 4 3 | ·5254 | | 4 6 | ·5890 | | 4 9 | ·6563 | | 5 0 | ·7272 | | 5 3 | ·8018 | | 5 6 | ·8799 | | 5 9 | ·9617 | | 6 0 | 1·0472 | | 6 3 | 1·1363 | | 6 6 | 1·2290 | | 6 9 | 1·3254 | | 7 0 | 1·4254 | | 7 3 | 1·5290 | | 7 6 | 1·6362 | | 7 9 | 1·7472 | | 8 0 | 1·8617 | | 8 6 | 2·1017 | | 9 0 | 2·3562 | | 9 6 | 2·6253 | | 10 0 | 2·9089 | | 10 6 | 3·2070 | | 11 0 | 3·5198 | | 12 0 | 4·1888 | +-------------+---------------+ THE MEASURE IN GALLONS, AND THE WEIGHT IN POUNDS, OF WATER CONTAINED IN WELLS, FOR EACH FOOT IN DEPTH. ------------+----------------+---------- Diameter. | No. of Galls. | Weight. ------------+----------------+---------- ft. in. | | 2 0 | 19·61 | 196·1 2 6 | 30·56 | 305·6 3 0 | 43·97 | 439·7 3 6 | 60·00 | 600·0 4 0 | 78·19 | 781·9 4 6 | 98·87 | 988·7 5 0 | 122·23 | 1222·3 5 6 | 147·96 | 1479·6 6 0 | 175·99 | 1759·9 6 6 | 206·59 | 2065·9 7 0 | 239·05 | 2395·0 7 6 | 275·49 | 2754·9 8 0 | 313·43 | 3134·3 8 6 | 353·03 | 3533·0 9 0 | 395·42 | 3954·2 9 6 | 441·71 | 4417·1 10 0 | 489·93 | 4899·3 ------------+----------------+---------- BRICKWORK.