INDEX. 



45? 



Numbers refer to Paragraphs. 



Specific gravity for gases, 248. 



u " u liquids, 242, 246. 



u " " solids, 242-245. 



" heat, 531-536. 

 Spectroscope, 638 (b). 

 Spectrum 635, 637, 648-653. 

 Spherical aberration, 633. 

 Spouting liquids, 254-256. 

 Sprengel's air-pump, 290. 

 Springs, Intermittent, 301. 

 Stability, 116. 

 Steam, 508, 529. 

 Steam-engine, 570. 

 Stereoscope, 665, 666. 

 Strings, Musical, 454, 455. 

 Successive induction, 340. 

 Surveyor's compass, 314. 

 Sympathetic vibrations, 443, 560. 

 Synthesis of light, 639. 



Tantalus's cup, 301. 

 Telegraph, 395. 

 Telephone, 408, 409, 445, 446. 

 Telescope, 660-663. 

 Temperature, 474, 494. 

 Tenacity, 48. 

 Tension, Electric, 350. 

 Tension of gases, 269, 282-287. 

 Terrestrial magnetism, 315, 316. 



M telescope, 663. 

 Tests for electricity, 330, 331, 332. 

 Theory, Hypothetical, 309. 



" of electricity, 335. 

 magnetism, 308. 

 Thermal effects of electricity, 365, 387. 



" spectrum, 650, 652. 



u units, 514. 

 Thermodynamics, 561. 



" First law of, 565. 



Thermo-electricity, 412, App. L. 

 Thermo-electric pile, 414. 

 Thermometers, 476-482. 

 Thermometric readings, 481. 



" scales, 480. 



Timbre, 464. 



Tones, Fundamental, 460, 461. 

 Torricelli, 274. 



Total internal reflection, 616. 

 Tourmaline tongs, 670. 

 Transferrer, 292 

 Translucent bodies, 581. 

 Transmission of pressure by Iiquids,2i6. 



Transparent bodies, 581. 

 Triangle offerees, 87. 

 Tubes, Acoustic, 433. 

 u Sonorous, 466. 

 Turbine wheel, 265. 



U 



Undershot wheel, 263. 



Undulations, 416. 



Unit of heat, 514. 



- " work, 153, 154. 



Universal properties, 18, 20. 



Upward pressure, 227, 228. 



V 



Vapor defined, 58. 

 Variation, Magnetic, 319. 

 Velocity, Increment of, 127. 

 " of electricity, 364. 

 " light, 588. 



Vertical needle, 314, 318. 

 Vibration of pendulum, 140. 

 Vibrations, Sympathetic, 443, 56*. 

 Visual angle, 587. 

 Voltaic arc, 389. 



" battery, 379-385. 



u electricity, 373. 

 Volta's pistol,- 37 i (35). 



W 



Water, Expansion of, 488, 489. 



u power, 260. 



" Specific heat of, 536. 



" wheels, 261-264. 

 Wave length, 418, 420, 437. 



u period, 417, 420, 436. 

 Waves, Coincident, 448. 

 Wedge defined, 205. 

 Wedge, Use of, 206, 207. 

 Weight defined, 33, 103. 

 Weight, Law of, 105. 

 Wheel and axle, Advantages of, 180. 



" " " defined, 179. 



" " " Forms of, 184. 



" " " Formulas for, 182. 



" " Law of, 183. 

 Wheels, how connected, 189. 

 Wheels, Water, 261-264. 

 Wheel-work, 185-188. 

 Work defined, 150. 

 Work, Unit of, 153. 



Zero cf temperature, Absolute, 493. 

 Zincs, Amalgamating, 386. 



r P 



