Deleuil, Louis, 334, 335, 336, 341 



Denayrouze, L., 395, 396 



Deprez, Marcel, 390 



Development of Electrical Technology in 

 the 19th Century: i. The Electro- 

 chemical cell and the Electromag- 

 net, 231-271. 2. The Telegraph 

 and the Telephone, 273-332. 

 3. The Early Arc Light and 

 Generator, 333-407 



Dolbear, A. E., 325, 327, 331 

 magneto telephone, 325 



Douglass, James N., 353, 362, 364, 366, 



374. 385. 386 

 Dredge, J., 336, 339, 345. 374, 378, 379, 



386, 404, 405 

 Drummond light, 356 

 Duboscq, Jules, 336, 337, 339, 341 



arc-light regulator, 342, 343, 354 

 E. S. Greeley & Co., 253 

 Ecole Militaire, Brussels, 356 

 Edison, Thomas A., 247, 308, 327. 328, 



329, 330. 331 

 cell, 247 



chalk telephone, 3 1 6 

 microphone, 326 

 storage battery, 252 

 Edmondson, T., 261 



motor, 262, 

 "Electra," ballet, 337, 338 

 Electric Power Corporation, 356 

 electrochemical telegraph, 298, 300 

 electromagnet, 255, 256, 314, 315, 318, 

 319. 345. 354. 375. 378, 380, 383, 

 405 

 electromagnetic telegraph, 298 

 Electromechanical Cell and the Electro- 

 magnet, 231-271 . 

 Elias, P., 266, 374 



ring armature motor, 267, 371, 374 

 Elkington, George R., 254, 351 



firm, Manchester, 254, 350. 351, 

 355. 362, 376 

 Exposition Universelle, Paris, 339 

 Fahie, J. J., 278, 292 



Faraday, Michael, 240, 260, 261, 289, 344, 

 345. 346, 349. 350. 352. 253. 354, 

 358, 366 

 circulating wire, 259 

 Farmer, Moses G., 268, 308. 309, 378 



electric train, 270 

 Faure cell, 252 

 Faye, 359 

 Fetes des Souverains, 361 



Feyerabend, Ernst, 282, 283, 284, 285, 



287, 294, 295, 296 

 Field, Cyrus, 305, 306 

 Fontaine, Hippolyte, 339, 343, 359, 367, 



368, 380, 383, 385, 386, 390, 404, 



405 

 Foucault, Leon, 337 



arc-light regulator, 336, 338, 339, 342 

 French Patent, 243, 308, 341, 356, 362, 



372, 380, 395, 405 

 Fresnel, A., 344 



lens system, 352, 354 

 Froment, G., 268, 269, 379 



motor, 270 

 Fuller's trough battery, 239 

 Gale, Leonard, 296, 297 

 Galvani, Luigi, 233, 234, 235 

 galvanic apparatus, 238 



deflagrator, 240, 242 

 galvanometer, 257, 306 

 Gassner, C, 247 



cell, 247, 254 

 Gauss, C. F., 282, 284, 286 

 Gauss and Weber telegraph, 282, 283, 284, 



289, 309 

 Gladstone, J. H., 351, 359 

 Gottingen astronomical observatory, 282 

 Gramme, Z. T., 368, 379, 380, 383, 385 



alternator, 400, 401, 402, 403, 405 



candles, 405 



dedouble armatures, 384, 385 



dynamo, 379, 380, 381, 382, 385, 386, 



390. 392. 393 

 machine, 362, 365, 366, 367, 369, 372, 



387. 388, 389, 394, 405 

 machine auto-excitatrice, 405 

 magneto, 377, 383 

 motor, 388, 389, 390 

 ring, 372, 374, 376, 377 

 type d'atelier dynamo, 382, 383, 384, 



385,386, 391.401. 405 

 Grands-Magasins du Paris, 404 

 Gray, Elisha, 315, 316, 317, 318, 320, 327, 



328, 331 

 electric organ, 316 

 harmonic multiple telegraph, 317 

 telephone transmitter and receiver. 

 318 

 Great Battery, Royal Institution of Great 



Britain, 238, 240 

 Great E.xhibition, London, 268 

 Great Western railway, 290 

 Grenet, 245, 249 

 Grenet cell, 249 



Grove, W. R., 243 



battery, 246, 356 



cell, 243, 245, 246, 263, 266, 268, 335 

 Guerout, A., 283, 284, 360 

 Halske, 286 



Hamel, J., 276, 284, 286, 350 

 Hare, Robert, 240 



calorimotor, 242, 259, 261 

 Hefner-Alteneck, Frederick Von, 372, 374 



dynamo, 378 

 Helmholtz, 315, 316, 318, 319 

 Henry, Joseph, 240, 250, 259, 261, 281, 

 289, 316, 320, 342, 343, 344 



electromagnetic motor, 260 



quantity electromagnet, 258, 259. 

 263, 289 



telegraph signal, 282 

 Higgs, Richard, 366, 374, 386, 387, 390, 



392. 393 

 Hippodrome, 397, 404 

 Hjorth, Soren, 268, 376 



motor, 271 

 Holmes, E. T., 331 



Frederick H., 351, 352, 353, 354, 356. 



357. 358, 362, 364, 366 

 alternator, 362, 372, 373 

 generator, 356, 358, 359, 360, 361. 



363. 364. 365. 376 



magneto, 367 



regulator, 354 

 Hopkinson, John, 361, 387, 392 

 Hotel des Invalides, 356, 357 

 House, Royal E., 300 



printing telegraph, 302, 303. 304 

 Houston, E. J., 314 

 Hughes, David, 302, 329 



microphone, 327, 329 



printing telegraph, 302, 303, 304, 305, 

 308 

 Hunnings, Henry, 330 



telephone transmitter, 329 

 Institut de France, 276 

 Isabella II of Spain, 342 

 Jablockoff, Paul, 393, 395, 396 



candle, 395, 396, 397, 404, 407 



electric system, 398, 399, 400, 401, 

 404, 405, 406, 407 



Societe Generale d'Electricite, 404 

 Jacobi, M. H., 254, 260, 262, 263, 269, 286 



motor, 263 



recording telegraph, 288 

 Jamin's compound magnets, 383 

 Johnson, Walter K., 268 



416 



BULLETIN 228: CONTRIBUTIONS FROM THE MUSEUM OF HISTORY AND TECHNOLOGY 



