INDEX. 



735 



Huber on universal telegraphy, 611 ; 

 statistics of electric telegraphy, 631 



Hughes, Professor, his printing telegraph, 

 583, 585 



Hugon's gas-engine, 509, 511 



Hull, J., proposed marine steam-engine, 

 446 



Humboldt, on the mariner's compass, 519 



Hunting horn, 175 



Huy gens' application of the pendulum to 

 clock-making, 23 ; his cycloidal pendu- 

 lum, 25 ; origin of the steam-engine, 391 



Hydraulic ram for compressing air, 72 



Hydraulic press, 4, 33 



Hydrometers, 37 



Hypatia, discovery of the areometer a- 

 scribed to her, 38 



1. 



Ice, artificial manufacture of, 382388 



Ice, burning-glass made of, 367 



Ice-houses, 358 



Illuminated clocks, 637 



Illumination, electric. (See Electric light). 



Inclination compass, 527 



India, formation of artificial ice in, 382 



Indicators, of steam-engines, 565, 574, 579, 

 581, 583, 507, 599, 616; of electric 

 telegraphs, 561, 563, 571 ; electric clocks, 

 634, 635 ; fire-damp, 624 



Indret steam-planing machines, 491 



Induction of electric currents, discovered 

 by Faraday, 661 



Inexhaustible bottle, 48 



Insulators for telegraph wires, 608 



Inverting telescope, 25o 



Invisible woman, the, an acoustic puzzle, 

 109 



Iodine, its application to photography, 295 



Iron, electro-plating on, 712 



Iron ships, their effect on the compass, 523 



Iron wires for telegraphs, 607, 610 



Isle Oronsay, azimuthal condensing light- 

 house, 230 



J. 



Jacobi's electro- motive engine, 651 ; dis- 

 covery of the electromotor, 702 ; process 

 of electrotyping, 705, 706 



James, Sir Henry, R.E., photolithographic 

 process, 317 



James, William, improvements in locomo- 

 tives, 462 



Jamiii's magneto-electric machines, 666 



Japanese gongs, 124 ; bells, 127 ; tam- 

 bourine, or Hing-Kou, 134 ; violins, 

 139 ; gotto, or Taki Koto, 155 



Jeanrenaud, his process of heliography, 

 319 



Jedlick's electro-motive engine, 651 



Jewish harps, ancient, 135 



Jew's harp, 122 



Joly's ventilating fireplace, 344 

 Jouffroy, Marquis de, inventor of a steam- 

 boat, 446 

 Jupiter, telescopic view of, 275 



K. 



Kehl, bridge at, 83 



Kepler's discovery of astronomical tele- 

 scope, 262 



Kettle-drums, 132 



Kircher, compound mirrors made by, 3b7 



Kosnig's improved stethoscope, 114 



Kcenig, F., first steam printing-machine, 

 491 



Krupp's steam-hammer, 488 



Laborde's discoveries in heliography, 317 

 Lachez, Th., application of acoustics to 



architecture, 116 

 Lackerbauer's improvements in microscopic 



photography, 310 

 Lactometers, 39 

 Laennec, inventor of the stethoscope, 



114 

 Lafont, M., combined engine (steam and 



chloroform vapour), 504 

 La Heve lighthouse, electric apparatus, 



681 



Lambert on speaking-trumpets, 111 

 Lamps, electric, 673 

 Lamps, safety, for miners, 361 

 Laplanders, clothing of, 359 

 Larmanjat's road locomotive, 478 

 Laubereau's hot-air engine, 507, 508 

 Laugier's apparatus for distilling alcohol, 



378 



Lenoir's gas-engine, 509, 510, 512 

 Lenses, their application to lighthouses, 



222, 227, 231 ; for telescopes, 260 ; for 



burning glasses, 369. (See Microscopes., 



Telescopes.) 

 Lenticular apparatus applied to lighthouses, 



226 

 Le Roux,his improvements in photography, 



308 



Leroy's compensation pendulum, 370 

 Le Sage's system of electrical communica- 

 tion, 544 



Lethuilier-Pinel, his magnetic gauge, 403 

 Letter-weights, 31 

 Levels and plumb-lines, 17 ; water-levels, 



41 ; spirit-levels, 42 

 Liburnse, ancient lloman ships 448 . 

 Lignite, its use and heating power, 354 

 Light, applications of the laws of, 6, 201 



329 



Light, electric, 668, 673, 679 

 Lighthouses, 220232, 662, 680 

 Lightning, 533 



