Bootle, wells at, 158 Borers or drills, 47 Boring, 60-80 ---- apparatus for, 61, 68, 71, 72 ---- at great depths, 85 ---- cost of, 80, 209 ---- chisels, 62, 87, 102, 115, 132 ---- difficulties of, 80 ---- direct from surface, 72 ---- Kind-Chaudron system, 93 ---- Mather and Platt's system, 126-149 ---- machine, Mather and Platt's, 127-130 ---- rate of, 207, 208 ---- rods, 64, 65 ---- rods, hollow, 80 ---- sheer-frame _Frontispiece_, 72 ---- tools, 62-79 Boston Heath, well at, 191 Bow, well at, 191 Box-clutch, 107 Box-joint for mizer, 57 Boxley Wood, well at, 191 Braintree, well at, 168, 191 Breaking-up bar, 139, 141 Brentford, well at, 191 Brick steining, 55, 59, 205 Bricks, good, characteristics, 205 Brickwork in wells, 205 Brighton, wells at, 168 Broken tubing, 74-79 ---- rods, extracting, 64, 107, 122 Bromley, wells at, 191 Broxbourne, well at, 191 Bucket, sinkers', 67, 150 Bucket grapnel, 140, 142 Bull or clay-iron, 50 Bunter sandstone, 35, 36 Burton-on-Trent, wells at, 156 Bushey, well at, 191 Butte-aux-Cailles, well at, 179 Camberwell, well at, 191 Camden Station, well at, 191 Camden Town, wells at, 192 Canterbury, well at, 192 Carbonic acid in wells, 209 Carburetted hydrogen in wells, 210 Cartridges for blasting, 50 Cast-iron tubes, 66, 143 Caterham, well at, 192 Cement backing, 111, 112 ---- ladle for tubbing, 111, 112 Chalk, 5, 7 ---- headings or tunnels in, 54 ---- level of water in, 8 ---- marl, 5 ---- rainfall on, 27 Charge of powder, rule for, 45, 46 Chelmsford, well at, 169, 192 Cheshire, thickness of trias, 36 Cheshunt, wells at, 170, 192 Chinese system of boring, 60, 61 Chisels for boring, 62, 87, 102, 115, 132 ---- or trepans, 113, 115 ---- tempering, 209 Chiswell Street, well at, 192 Chiswick, wells at, 192 Clamp for tube well, 81 Claw grapnel, 139 Clay, 12 ---- grapnel, 140, 141, 143 ---- iron or bull, 50 Cleaning pipes, tube well, 83 ---- shot-holes, 49 Clewer Green, wells at, 192 Cold-drawn wrought-iron tubes, 66 Colnbrook, well at, 192 Colney Hatch, well at, 192 Core box, 206 Core grapnel, 140 Cost of boring, 80, 209 ---- of headings in sandstone, 54 Covent Garden, well at, 192 Coventry, wells at, 155 Covered outcrop, 21 Cretaceous strata, 167-201 Crewe, wells at, 158 Cribs, fixing, 94 Cricklewood, well at, 192 Crow, Kind-Chaudron, 107 Crow's foot, 64 Croydon, wells at, 192 Curb in underpinning, 40 Cutting grapnel, 139, 141 Cylinder, Mather and Platt's, 130 Cylinders, iron for lining, 56 Dartford Creek, wells at, 193 Deep boring, 72, 85-150 Defective tubing, 74-79 Denham, well at, 193 Deptford, well at, 193 Depth of rainfall, 26 Difficulties of boring, 80 Dip-bucket, 150 Dogs, 65, 67 Dolly, 67, 74