'32 



INDEX. 



Cooke's inventions in elective telegraphy, 

 546 ; telegraph, single-needle, 550 ; tvvo- 

 needie, 554 



Cooke, Conrad, electric light at the Houses 

 of Parliament, 685 



Copper-plating by electrotype, 703 



Copper-plate engravings reproduced by 

 electrotype, 707 



Copper electro-plating, M. Oudry's process, 

 718 



Copper wires for telegraphs, 607, 612 



Cor d'harmonie, 174 



Cordovan, lighthouses at, 220, 221, 227 



Cornet-a-piston, 177 



Cornish steam-engine, 394 



Cotton, Sir Arthur, his applications of the 

 eolipyle, 390 



Cotton as a heat-conductor, 360 



Cox's application of the voltaic current, 

 544, 597 



Crampton's locomotive, 467, 470 



Cranes, steam, 484 



Crossley's improvements in gas-engines, 

 511 



Cuff's simple microscope, 237 



Cugnot's steam-carriage, 461 



Currie, Messrs., distillery at Bow, 380 



Cylinders of steam-engines, 411 ; of mar- 

 ine-engines, 457 



Cymbals, 123 



D. 



Dagron's improvements in microscopic 

 photography, 310, 311 



Dagueire and Niepce, inventors of photo- 

 graphy, 289, 290, 291, 292 



Daguerreotype, 29'J, 294, 313 



Daguin, mechanism of the violin, 145 



Dalibard's experiments with lightning con- 

 ductors, 532 



Dallery's screw-propeller, 451 



Daniell's electric batteries applied to tele- 

 graphy, 620 



Davy, Sir Humphry, origin of photogra- 

 phy, 290 ; safety-lamp, 361 



Declination compass, 519, 521 



Delambre's perpendicular level, 18 



De La Rive, M., improvements in photo- 

 graphy, 307 ; discovery of electro- 

 plating, 703 



De La Rue, Warren, applications of photo- 

 graphy to astronomy, 327, 329 



Deleuil's air-pump, 63 



Delisle, Captain, application of the screw- 

 propeller, 452 



Dent's compensation pendulum and bal- 

 ance, 373, 375 



Desgoffe and Ollivier's sterhydraulic press, 

 36 



Detouche's time-dial, 637 



Dew, formation of, 382 



Dial telegraphs, 548, 559 572 



Diderot, sound of bells, 125 ; origin of the 



guitar, 154 ; mechanism of the organ, 



190 

 Digi icy-Morse electric writing telegraph 



579 



Dioptric lighthouses, 222 ; telescopes, 251 

 Dip-circles, 527 



Direct-motion steam-engines, 427, 457 

 Distillation, processes and apparatus for, 



376 



Dollond's improvements in optical instru- 

 ments, 253 



Domestic applications of heat, 363 

 Double-action pumps, 52 

 Double-bass, 148 

 Draining machines, 55,. 82 

 Drawings reproduced by the pantelegraph, 



600 



Drums, 119, 131 

 Duboscq's electric-lamp regulator, 674, 677, 



681 ; electric-light apparatus at Paris 



Opera House, 681, 683 

 Duchenne's electro-medical apparatus, 722 

 Ducos du Haurori's process of chromo-helio- 



graphy, 322 



Du Gardin's process of heliography, 319 

 Dujardin's printing- telegraph, 583 

 Dumas' improvements on the daguerreo- 

 type process, 294, 296 

 Dumas and Benoit's electric - lamp for 



miners, 690 

 Dunkerque, chimes of public clocks at, 



128 



Duplex telegraphy, 629 

 Dupuy de Lome's experiments in aerial 



navigation, 101 ; marine engine, 471 

 Duquest, his application of the screw to 



navigation, 451 

 Du Quet, paddle-wheels proposed by, 



448 



Dwellings, conductibility of heat in, 357 

 Dynamo-electric light machine, 670, 685, 



689 



K. 



Earthenware stoves, 345 



Ear-trumpets, 113 



Eclipses, photographic representations of, 

 327 



Edwards' process of heliography, 319 



Egyptian mirrors, ancient, 202 



Eider-down as a heat-conductor, 361 



Electricity, 531 726 ; applications of the 

 laws of, 8 ; lightning-conductors, 531 ; 

 chimes of bells, 131 ; clocks, 633, 639 



Electric light, 307, 667, 673, 679 



Electric lighthouses, 680 



Electric telegraphy, 9, 543 632 jits inven- 

 tion, 543 ; general theory, 546 ; needle- 

 telegraphs, 548 ; dial-telegraphs, 559 ; 

 time-signals, 645 



Electro-chemical telegraphs, 597 



Electro-chemistry, 702 



