_Stella_, the, 228 Stephenson, George, 221 Stern, height of, 153, 172, 201 Stern-wheel boats, invention by Robert Stevens of, 63, 258 Stettin Vulcan Co., 174 Stevens, John, stern-wheel steamer of, 63; proposal from Fulton to, 64; the _Phœnix_, 76, 118 Stevens, Robert, invention of tubular boilers by: first screw-steamer of, 63 Stone-Lloyd water-tight doors, 191 Strain, 98, 99, 126; minimised by length, 139; effect of iron and wood in, 146–7 Submarine signalling, 172; on Great Eastern boats, 229; methods of, 305 Subsidy, Cunard Co.’s first, 106; Royal Mail Steam Packet Co.’s first, 112; reduction of, 113; for _Mauretania_ and _Lusitania_, 198 “Suction” dredger, 239, 240 _Suevic_, the, 295 Suez Canal, 115, 116, 117; limitations imposed by, 215 “Sun-and-planet” gear, 37, 47 _Sunbeam_, the, 270 Sutcliffe, Mrs., on Fulton, 50, 61 Swan, Hunter and Wigham Richardson, 212 Symington, William, engine for Miller’s boat by, 43; the _Charlotte Dundas_, 46 _Talbot_, the, 221 Taylor, James, 42 Taylor, Naval Constructor D. W., experiments in resistance by, 67 Telegraph ships, 242–3 Telephone, use of on _Balmoral Castle_, 219; installation on liners of, 305 _Teutonic_, the, 168, 179 _Teviot_, the, 110 Thames, first steamship on the, 83 _Thames_, the, 84, 111 Thompson, George, & Co., 216 “Three-island” type, 283 _Titanic_, the, 207, 211, 289 Tonnage, of “turret-ships,” 247; measurements of, 312; Royal Commission on, 313; anomalies of, 313–4 “Tonnage-deck,” 312 _Tonquin_, the (ex _City of Paris_), 149 “Topgallant” forecastle, 284 Torricelli, Evangelista, discovery of weight of atmosphere, 20 Towing, feats of, 236–7 Train-ferries, 251 Tramp steamer, the, 250 Trawlers, steam, 252 _Trent_, the, Slidell and Mason incident, 113 _Triad_, the, 270, 278, 279 Trial trip, how carried out, 292, 293 Triple-expansion engines, principle of, 117, 166 “Trunk-deck” steamer, 248 Tubular boiler, 133 Tugs, variety of, 234; “Cock” type, 235; Dutch, 236; salvage, 237; New York Harbour, 237; as passenger tenders, 238; paddle-wheel, 239; as trawlers, 252 Turbine, Giovanni Branca and, 20; importance of, 183; invention of, 184; Parsons system of, 186; the _Carmania’s_, 187; faults of, 188; the _Vespasian_ experiment, 189; of _Virginian_ and _Victorian_, 190; of _Carmania_, 192; of _Mauretania_ and _Lusitania_, 197, 201; low-pressure of _Laurentic_, 210; on cross-channel boats, 226; on Great Eastern Railway Co.’s boats, 230; on Isle of Man boats, 230; reliability of, 230; on yachts, 274 _Turbinia_, the, 187 Turret-ships, 245; comparison with “whale-back,” 265 Turtle decks of _Oceanic_, 153; of _Umbria_, 158; of _Victoria_, 163; of _Majestic_, 168