Reis's musical telegraph, 157.
S
Sanders, Thomas, 148, 159, 178.
Scribner, Charles E., 236.
Searchlight telephone, 251.
Semaphore signals, 27.
Shouting sentinels, 16.
Sibley, Hiram, 96, 99.
Signal columns, 19.
Siphon recorder, 137.
Smith, Francis O.J., 76.
Stentorophonic tube, 18.
Submarine signals, 31.
T
Telegraph, first suggestion, 39; patented, 82; development, 264. Telephone invented and patented, 162; at Centennial, 165; exchange, 177. Thomson, youth, 144; cable adviser, 121; invents mirror galvanometer, 126; knighted, 136; invents siphon recorder, 137; connection with telephone, 169. Transatlantic cable (See Atlantic cable). Transatlantic wireless telegraphy, 216. Transatlantic wireless telephone, 259. Transcontinental telegraph, 96. Transcontinental telephone, 246. Transcontinental wireless telephone, 257. Trowbridge, John, 190. Troy, signaling fall of, 14. Tuning the wireless telegraph, 222.
V
Vail, Alfred, arranges Morse code, joins Morse, 70;
makes telephone apparatus, 72;
operates first line, 90;
improves telegraph, 100.
Vail, Theodore, joins telephone forces, 180;
puts wires underground, 239;
adopts copper circuits, 240;
resumes telephone leadership, 244;
talks across continent without wires, 257.
W
Watson, aids Bell with telephone, 159;
telephone partner, 175;
helps demonstrate telephone, 175;
telephones across continent, 248.
Western Union, organized, 96;
enters telephone field, 178.
Wheatstone, 1;
boyhood, 45;
five-needle telegraph, 49;
single-needle telegraph, 52;
Wheatstone-Cooke controversy, 52;
automatic transmitter, 53;
bridge, 53;
opposes Morse, 78;
encourages Bell, 145.
Wig-wag system, 26.
Wireless telegraphy suggested, 188;
invented, 202;
on shipboard, 221;
in the future, 230.
Wireless telephone, conceived, 250;
future, 260;
in navy, 261.
End of Project Gutenberg's Masters of Space, by Walter Kellogg Towers