Smithsonian Institution, 237, 238, 249, 

 256, 258, 259, 264, 266, 267, 268, 

 269, 295, 298, 299, 300, 301, 303, 

 315. 3'6, 318, 320, 321, 324, 325, 

 326, 328, 329, 343, 395 

 Societe d'Encouragement pour I'Industrie 



Nationale, 340 

 Societe des Machines Magneto-electriques 



Gramme, 380 

 Societe I'AUiance, 356, 357, 366, 369, 405 

 Soemmerring, Samuel T., 276, 279 



electrochemical telegraph, 279, 280, 

 282, 284, 286 

 Sorbonne, 345, 362 

 Soiiter Point lighthouse, 373 

 South Foreland lighthouse, 354, 364 

 Speedwell Iron Plant, 298 

 Spencer, 254 

 Spender, T., 254 

 Staite, W. Edward, 337, 338 

 arc light, 337, 338, 339 

 regulator, 336, 338, 339 

 Stearns, Joseph B., 308 

 duplex circuit, 312 

 Steinheil, Karl A., 284 



telegraph, 283, 284, 285 

 Sturgeon, WiUiam, 241, 258, 261, 262 

 electromagnet, 257 

 motor, 262 

 Taylor, William, 265 

 Telegraph, needle, 278 

 Ten Eyck, 260 



The American Speaking Telephone Com- 

 pany, 325, 327 

 Thiers, Rudolphe, 340, 342, 344 

 Thomalen, Adolf, 378, 379 



418 



Thompson, Silvanus P., 306, 312, 314, 376 



Thomson, William, 306 

 siphon recorder, 306 

 speaking galvanometer, 305 



Thunderer, HMS, 394 



Tresca, Henri E., 367, 368 



Trinity House, 352, 353, 354, 356, 364, 

 366, 367 



trough battery, 235, 238, 239, 240 



Turnbull, L., 296 



Tyndall, John, 353, 366, 374, 386 



U.S. National Museum, 237, 238, 249, 256, 

 258, 259, 264, 266, 267, 268, 269, 

 299. 300, 30'. 303> 318, 320, 321, 

 324> 325. 326, 327, 395 



U.S. Patent, 247, 264, 268, 300, 303, 304, 

 308, 312, 316, 317, 318, 321, 324, 

 325, 326, 329, 330, 331, 332 



U.S. Patent Office, 263, 303, 329, 395 



U. S. Supreme Court, 330, 331 



Vail, Alfred, 294, 297, 298, 300, 301 



van Malderen, Joseph, 356, 379 



Varley, Cromwell F., 243, 306 



Varley, S. Alfred, 378 

 dynamo, 379 



Vienna Exposition, 372, 378, 385, 386, 391 



Volta, Alessandro, 233, 234, 235, 236, 248 



Volta prize, 268 



Voltaic pile, 234, 237 



Walker, Charles V., 254, 305 



Wartmann, L. F., 342 



Watkins, Francis, 262 

 motor, 263 



Watson, Thomas A., 320, 321, 331 

 polarized motor, 330, 331 



Weber, Wilhelm, 282, 284 

 Western Electric Manufacturing Com- 

 pany, 316 

 Western Union Telegraph Company, 



299= 3°°: 319. 325. 327. 33' 



quadruplex circuit, 313 

 Weston, E., 247 



cell, 247, 248, 256 

 Wheatstone, Charles, 286, 291, 292, 375, 



378 

 ABC telegraph, 296 

 automatic telegraph, 297, 308 

 Wheatstone-Cooke dial telegraph, 291 , 295 

 Wheatstone-Cooke single-needle telegraph, 



293: 294 



Wheatstone-Cooke step-by-step transmit- 

 ter, 295 



Wheatstone-Cooke telegraph, 289, 290, 



291= 309 

 White, A. C, 330 



"solid back" telephone transmitter, 



329. 330 

 Wilde, Henry, 375, 378 

 Williams, Charles, 324 

 Wollaston, William, 239, 256 



U-shaped electrodes, 241 

 Woodbury, Levi, 296 

 Woolrich, John S., 350 



disk armature machine, 351, 405 



generator, 350, 351, 353, 354, 355, 

 356, 380 

 Wormell, R., 239, 245, 246, 252 

 Wright, John, 254 



Thomas, 265 

 Yarmouth and Norwich railway, 290 



