Stevenson, David, “North Unst,” 9 Stevenson, David and Charles: the acetylene gun, 68-71; the unattended light, 269; the Platte Fougère fog-signal, 270-71; the Otter Rock light, 297; scheme for Rockall, 300 Stevenson, David and Thomas: works carried out by, 15, 53; the Chicken Rock light, 94; building of the Dhu-Heartach, 114-20 Stevenson, family of engineers: preeminence of, 8-10; systems of lighting, 36-38; adoption of electricity, 219-22; work in Japan, 258; characteristics, 305 Stevenson, George, and the Fastnet, 122 Stevenson, Robert, and the Bell Rock lighthouse, 9, 97-100; Skerryvore, 101 Stevenson, Robert Louis, “A Family of Engineers,” 8-9 Stevenson, Thomas, 9, 222 Stewart Island, 237 Stornoway lighthouse, lighting, 53-54 Strain, Samuel H., 306 Subsidiary lights, 53-55 Suez, 312 Sugar-Loaf Point lighthouse, 232 Sule Skerry lighthouse, 9, 39 Sumatra, 257 “Sun-valve,” the Dalén, 275-78 Superior, Lake, lighting of, 214, 216, 217 Sweden: floating lighthouses, 291; unattended lighthouses, 277-82 Swift, Captain W. H., the Minot’s Ledge light, 176-78, 182 Sydney lighthouse. _See_ Macquarie Tower _Tararua_, steamship, wreck of the, 236, 237 Tay, Firth of, 96 Terawhiti, Cape, 238 Thames lightships, 240-41 Thomas, O. P., 260 Three Kings Rock, 236 Tierra del Fuego, 268 Tillamook Head, 183 Tillamook Rock lighthouse, 13-15, 183-95, 204; the keepers, 307-8 Tiri-Tiri Island lighthouse, 236-38 Torrain Rocks, 113 Tory Island lighthouse, 39 Trade, Board of: collection of light dues, 7-8; and the siren, 61; Mr. Ingrey’s scheme, 64; adoption of electricity, 219 Trewavas, John R., death of, 14-15 Triangle Island, British Columbia, light, 174 Trinity House Brethren: purchase of patents, 6; maintenance of English lights, 7, 26; adoption of the Daboll trumpet, 60; and the Eddystone, 77; and the Wolf Rock, 88-89; and the Whiteside light, 93; and the Fastnet, 122; adoption of electricity, 218, 223; the light on the Seven Stones, 248 Trinity House Museum: Smeaton’s clock, 76-77; Bishop Rock fog-bell, 85-86 _Triumph_, steamship, wreck, 236 Tyndall, Professor, 59 Tyree, island of, 100, 102, 105, 107 United States Corps of Engineers, 63, 198 United States Lighthouse Board, 13 36, 195; coastline lighting, 20, 196-207; methods of lighting, 46-47; inauguration, 198; extent of control 206-7; lighting of the Great Lakes, 208-17; lightship service, 255; adoption of the Aga light, 294-95 United States Typographical Engineers, 176 Unst, island of, 112 Ushant, 148, 156, 157 Ushant Island, 158 Vancouver, 173; coastline, 284 Vancouver Island, 174 Victoria, 173 _Victoria_, steamer, wreck, 303-4 Waipapapa Point lighthouse, 236, 237 Walker, James, 8; Bishop Rock light, 84-5