454 



Numbers refer to Paragraphs. 



Heat, Reflection of, 554. 



u Refraction of, 556. 



" Sensible, 516, 517. 



" Specific, 531-536. 



14 units, 514. 

 Heliostat, page 376 (note). 

 Holtz electric machine, 349. 

 Horizontal needle, 314. 

 Horse-power defined, 155. 

 Human eye, 657. 

 Hydrokinetics, 254. 

 Hydrometers, 249-252. 

 Hydrostatic bellows, 222. 

 u paradox, 229. 



" press, 223. 



Hypothetical theory, 309. 



Iceland spar, 673. 



Images, Construction for, 597, 603, 605. 



" Inverted, 585. 



" Multiple, 598. 



u Projection of, 606 



" Real, 604-607, 629, 630. 



" Virtual, 595, 608, 610, 631, 632. 

 Impenetrability defined, 31. 

 Incidence, Angle of, 97. 

 Inclination, Magnetic, 318. 

 Inclined plane, 198-204. 

 Incompressibility of liquids, 215. 

 Increment of velocity, 127. 

 Indestructibility of energy, 162. 



" matter, 37. 



Index of refraction, 613. 

 Induced electric currents, 403. 

 Induction, Electric, 337-34- 



" Magnetic, 311, 312. 

 Inertia defined, 38. 

 Intensity of light, 589. ^ 



Intensity of sound, 431, 432. 

 Interference of sound, 451. / 

 Intermittent springs, 301. 

 Internal reflection of light, 616. 

 Inverted images, 585. 

 Invisibility of light, 593. 



Joule's equivalent, 566. 



K 



Kinetic energy, Formula for, 157- 

 u unit of force, 63. 



Latent heat, 518-530. 

 Lateral pressure, 230, 231. 

 Lenses, 622. 

 Leslie's cube, 554, 558. 

 Lever, Classes of, 169. 

 " Compound, 178. 

 u defined, 168. 

 " Laws of, 170. 

 Leyden battery, 357. 

 " jar, 353-356. 

 Lifting-pump, 294. 

 Light defined, 579. 

 u Diffused, 592. 

 " Dispersion of, 636. 

 Electric, 653. 

 Invisibility of, 593. 

 Motion of, 584. 

 Polarization of, 667. 

 Reflection of, 590. 

 Refraction of, 612. 

 Synthesis of, 639. 

 " Velocity of, 588. 

 Lightning, 362. 

 Lightning-rods, 363. 

 Liquid defined, 55, 6x. 



u rest, Conditions of, 232. 

 Liquids, Equilibrium of, 233. 



" flowing through pipes, 257, 



259- 



u in communicating vessels, 234, 



u Incompressibility of, 215. 



" Spouting, 254-256. 

 Liter defined, 29. 

 Loudness of sound, 431. 

 Luminous bodies, 580. 



" effects of electricity, 366. 



u spectrum, 649, 652. 



M 



Machine cannot create energy, 164, 165. 



" defined, 163. 



" Laws of, -167. 

 Uses of, 166. 

 Machines, Compound, 211. 



u Electric, 345-349- 

 Magic lantern, 664. 

 Magnet, Artificial, 303, 



" Natural, 302. 

 Magnetic curves, 313. 



il declination or variation, 319. 



" effects of electricity, 367, 392. 



