Paris, wells at, 179 Pass pipes for tubbing, 98 ---- valves for tubbing, 98 Passy, well at, 85, 180 Pebble Hill, section at, 14 ---- beds, 36, 37 Peckham, well at, 197 Penge, well at, 197 Pentonville, wells at, 197 Permeability of new red sandstone, 37 Permian strata, 155 Picker, 58 Pimlico, wells at, 197 Pinner, well at, 197 Pipe-dolly, 67 ---- iron, 74 Plaistow, well at, 197 Planes of bedding, 12 Plant, Dru's system, 114, 115 ---- Kind-Chaudron system, 99 ---- well sinking, 40-58 ---- well boring, 61-79 Plug, tube straightening, 140, 149 Plugs for tamping, 52 Ponders End, wells at, 187, 197 Porous soils, 8 Position of outcrop, 18 ---- of well, 207 Pot mizer, 57 Preparations for sinking, 40 Pricker, 50 Primary beds, 5, 9 Principles of blasting, 45 Prong grapnel, 139, 149 Pudsey Hall, well at, 198 Pumps, Mather and Platt's, 149-154 Quantity of brickwork in wells, 205 Quicksand, modes of piercing, 98 Rainfall, 24 ---- on new red sandstone, 37 ---- on outcrop, 11 ---- tables of, 28-32 Rain-gauge, instructions for using, 24 Ratcliffe, wells at, 198 Rate of boring, 207, 208 ---- ----, Dru, 123 ---- of working, Mather and Platt's, 137 Reculvers, section at, 12 Regent's Park, wells at, 198 Rhætic beds, 5 Richmond, wells at, 198 Rimers, 68 Riming spring, 68 Ring for broken rods, 64 River deposits, 22 Rock, chisels for, 62, 87, 102, 115, 132 ---- intersected by dyke, 4 ---- sinking in, 44 Rod guides, Dru's, 121 ---- joints, Dru's, 121 ---- at Passy, 86, 89 Rods, boring, 64, 65 ---- boring, Dru's, 120, 121 ---- Kind-Chaudron system, 101 ---- remarks on, 126, 127 Romford, well at, 198 Rope, boring with, 60, 130 Ross, well at, 165, 166 Rotherhithe, wells at, 198 Ruislip, well at, 198 Running sands, Dru's system, 125 Saffron Walden, well at, 198 St. Helens, wells at, 166 Sand, 11 ---- Mather and Platt's system, 143 Sandhurst, well at, 198 Sandstone, new red, 35 Sandwich, well at, 198 Scaffolding for boring, 71 Scratcher, 58 Screw grapnel, 139, 142 Screw-jacks, 144, 145 Searching for water, 9 Secondary beds, 5 Setting rain-gauge, 24 Shallow surface springs, 21 Sheer-frame, boring, _Frontispiece_, 72 Sheer-legs, 69 Sheerness, wells at, 198 Shell, 63, 122 ---- at Passy, 90 ---- Kind-Chaudron system, 105 ---- or auger, 63 ---- pump, Mather and Platt's, 134, 136 ---- ---- jammed, 141, 142 Shoreditch, well at, 198 Shorne Meade Fort, well at, 198 Shortlands, well at, 199 Shot-holes, boring, 48 ---- in wet stone, 50 Sinkers' bucket, 67, 150 Sinking mine shafts, 93 ---- plant for, 96 ---- with drum curb, 42 Sinkings in Durham, 93 ---- in hard rock, 44-53, 94 Site for rain-gauge, 24 Slate, rainfall on, 27 Slope of hills, outcrop on, 19