Slough, wells at, 199 Small-shot system in blasting, 44 Smithfield, well at, 199 Snow, measuring fall of, 25 South America, rainfall, 31 Southend, well at, 199 Southwark, wells at, 199 Speed of holing with hand-drills, 48 Spitalfields, well at, 199 Spithead, well at, 146 Spring, definition, 1 ---- cutter for tubes, 78, 79 ---- darts, 67 ---- pole, 61 Springs, 1, 2 ---- in alluvium, 7 ---- in drift, 6 ---- in chalk, 7 ---- in permeable strata, 1 ---- surface, 21 Staffordshire, thickness of trias, 36 ---- wells in, 162, 163 Steam jet for ventilation, 52 Steel for drills, 47 Steining, 40, 43, 54-59 Stemmer or tamping bar, 51 Step-ladder, 139, 141 Stifford, well at, 199 Stockwell Green, wells at, 199 Stone steining, 55 Storing well-water, 206 Strata, disturbances of the, 32 ---- table of, 202, 203 Stratford, wells at, 199 Stratified rock, blasting in, 46 Streatham, well at, 199 Stud-block, 66 Sudbury, well at, 199 Sulphuretted hydrogen in wells, 210 Superficial area, extent of, 11 Superintending well-work, hints on, 206 Surface, height of strata above, 23 ---- of outcrop, 11 ---- springs, 21 Swanage, Dorset, well at, 167 Tables of excavation in wells, 204 ---- rainfall, 28-32 ---- of strata, 202, 203 Tamping, 50, 51 ---- bar, 51 ---- tools, 50-52 T-chisels, 62 Tempering boring chisels, 209 Tertiary beds, 5 ---- district, division of, 34 Testing machine, for tubbing, 108, 109 Thames Street, Upper, well at, 200 Tillers, 62, 65 Timber steining, 55 Tongs, 67 Tools for well boring, 62-79 Top rods, 65, 66 Tottenham, wells at, 199 Tottenham Court Road, well at, 199 Tower Hill, well at, 199 Trafalgar Square, well at, 199 Trepan at Passy, 85 ---- Dru's first, 113 ---- Kind-Chaudron system, 101-105 ---- Kind's, 86, 87 Trias strata, 35, 36, 155 Tubbing, 94, 95 ---- pass pipes for, 98 ---- placing Kind-Chaudron, 108, 109 ---- testing machine for, 108, 109 Tube clamps, 67 ---- forcing apparatus, 74, 144-148 ---- grapnel, 139, 149 ---- joints, 66, 75 ---- well, American, 81 Tubes, 66, 143 Tubing, when necessary, 73 Tunnels or headings, 53, 54 Underpinning, 40 Upchurch, wells at, 199, 200 Upper Thames Street, well, at, 200 Uxbridge, wells at, 200 Valleys, drift in, 6 ---- outcrop in, 18 Valve for mizer, 56, 57 Valves for shell, 64, 122, 123, 134 Vauxhall, well at, 200 V-chisels, 62 Wad-hook, 64 Waltham Abbey, well at, 200 Walthamstow Marsh, well at, 200 Wandsworth, wells at, 200 Warwickshire, thickness of trias, 36 Water in new red sandstone, 38 ---- measure and weight in wells, 204 ---- searching for, 9 Water-bearing deposits, value of, 10 ---- strata, height of, above surface, 23 ---- ---- sinking through, 56, 93 Well, Artesian, definition, 2