D.

Daguerre, 609.

Daguerreotype, 610.

Daimler motor, 24.

Dallmeyer, 617.

Daniell’s battery, 495.

De Beers Mines, 707.

Delphi, oracle at, 739.

Dial telegraphs, 566.

Diamond cutting, 700.

Diamond, qualities of the, 698. rock drill, 359.

Diamondiferous, 703.

Diamonds, 696. use of, 701.

Dioptric lighthouse apparatus, 600.

Discoveries, progressive, 802.

Dissipation of energy, 808.

Distinct vision, 458.

D lines of sodium spectrum, 425, 441.

Dolls, talking, 674.

Domestic consumption of coal, 755, 756.

DOUBLE REFRACTION AND POLARIZATION, 399.

Dredges, Suez Canal, 255.

Drilling machine, 90.

Dry digging, 702.

Duboscq’s electric lamp, 497.

Du Moncel, 590.

DYNAMICAL ELECTRICITY, 490.

Dynamo, Siemens’, 522. Brush, 522.

E.

Earl’s Court, Great Wheel at, 83.

Earth’s circuit, 574.

Ebonite, 728.

Eccentric, 9.

Eclipse of sun, 438.

Eddystone lighthouse, 594.

Edison, 669, 670, 674.

Edison’s kinetoscope, 478.

Eiffel Tower, the, 72.

ELECTRIC LIGHTING AND ELECTRIC POWER, 519.

Electric current, 790. furnace, 722.

ELECTRIC INDUCTION, 488. launch, 534. light, cost of, 43.

Electric light in lighthouses, 515. telegraph, 598. torpedo, 547. tramway, 532. welding, 537.

ELECTRICITY, 481.

ELECTRICITY, THE NEW, 538.

Electrode, 497.

Electro-magnet, 500.

Electromotive force, 494.

Electro-plating, 499, 518.

Electrotyping, 634.

Elementary bodies, 716.

ELEMENTARY PHENOMENA OF MAGNETISM AND ELECTRICITY, 483.

Elswick 4·7–in. gun, 206. guns, 194.

Energy, 806.

Ether, 735. the luminiferous, 408.

Exhaustion of coal, 755, 756, 757.

Expansive working of steam, 8, 17.

Explosion by concussion, 745. of locomotive, 21. of torpedoes, 229.

EXPLOSIVES, 225, 740. different effects of, 748. names and classes of, 750.

EYE, THE, 451. dimensions of some parts of, 462.

Eye not optically perfect, 462.

Eyeballs, muscles of, 461.

F.

Fairbairn, Sir W., 280.

Faraday, 506, 508, 735. ventilating gas-burner, 773.

Faure’s accumulator, 530.

Fellahs, 255.

Ferris wheel, Chicago, 81.

Field telegraphs, 555.

FIRE-ARMS, 169.

Fish-plates, 105.

Fizeau, 386.

Floating matter in air, 383.

Fluids, electric, 487.

Fly-wheels, 7.

Force, conservation of, 804. electromotive, 494.

FORTH BRIDGE, THE, 311.

Foucault, 387.

Fovea centralis, 456, 457.

Fraser-Woolwich guns, 195.

Fraunhofer’s lines, 420, 436.

Fresnel’s mirrors, 409. measurement of velocity of light, 600.

Fribourg Suspension Bridge, 286.

Froment’s dial telegraph, 567.

Furnace, electric, 322.

G.

Galvanic batteries, 493, 494.

Galvanometer, 493. mirror, 570.

Gas engine, 25. governor, 769. holder, 766. making apparatus, 765. meters, 775. pressure, 769. retorts, 766.

Gases of blast furnace, 49.

Gatling battery gun, or mitrailleur, 219.

Gauge, broad and narrow, 106. Bourdon’s pressure, 12.

Geissler’s tubes, 505.

Ghost, Pepper’s, 392.

Giffard’s injector, 11.

GIRDER BRIDGES, 280.

Glass, strains in, 407.

_Glatton_, H. M. S., 161.

Glynde, electric railway, 534.

GOLD, 686.

GOLD AND DIAMONDS, 687.

Gold-mining operations, 690.

Goodyear, Mr., 727.

Governor of steam engines, 6.

Gower Street Station, 114.

Gramme magneto-electric machine, the, 511.

Graphophone, 672.

Graphotype, 644.

Gray, 590.

GREAT BROOKLYN BRIDGE, 303.

_Great Eastern_, 133, 152, 330, 465, 578.

GREATEST DISCOVERY OF THE AGE, 801.

Greener’s expanding bullet, 182.

Grove, Sir W. R., 804.

Grove’s battery, 495.

Gun, 32–pounder, 191. 68–pounder, 192. 35–ton, 201. 81–ton, 201. 100–ton, 201. 110–ton, 202. Elswick 4·7–in., 206. Maxim, 225. Moncrieff, 208. Nordenfelt, 223.

Gun-cotton, 747. torpedoes, 233.

Gunpowder, 734.

Guns, Armstrong’s, 192. Elswick, 194. Fraser-Woolwich, 195. Krupp’s, 214. quick-firing, 206. submarine, 240.

GUTTA-PERCHA, 728.

H.

Half-tone process, 629.

Hancock, Mr. Charles, 729. Mr. Thomas, 725.

Harvey’s torpedoes, 234.

Heat produced by electric current, 502.

Heat spectrum, 613.

Heating by gas, 776.

Helmholtz, 462, 464, 472, 474.

Henry, on Leyden jar discharge, 538.

_Hercules_, H.M.S., 150.

Hertz, Professor, 541.

Hippocampus, 664.

Hoe’s printing machines, 316, 318.

Holmes’ magneto-electric machine, 520.

Holophotal light, 604.

Holyhead and Kingston steamers, 136.

Horseless carriages (_Automobiles_), 23.

Horse-power, 10.

Hot-blast, 48.

Hotchkiss quick-firing guns, 208.

Hough’s metereograph, 654.

Howitzers, 213.

Hudson River steam navigation, 147.

Hughes’ printing telegraph, 560. microphone, 590.

HYDRAULIC POWER, 324.