INDEX. 



847 



KEF 



811 ; of sound, 341; double, by glass 

 mirrors, 435 ; by unsilvered glass, 436 



Reflectors, 532 



Kefracting telescope, 525 



Refraction of light, 454 ; through 

 prisms, 459 ; through lenses, 466 



Regulator of electric light, 671 



Repulsion, electrical, 555 ; magnetic, 707 



Reservoir of water frr physical experi- 

 ments, how to construct, 255 



Resonance, 355 



Rest, state of, 43 



Retardation of ebullition, 805; of solidi- 

 fication, 787 



Retina, 515; persistence of impressions 

 on, 546 



Retort-stand, 24 



Reversion of bright lines in spectrum, 

 507 



Rheoscope. 747 



Rigidity, absolute, 152; flexural, 152 



Rimer, use of, 100 



Ring acted on by centrifugal forcp, 138 



Rock-salt, heat transmitted through, 811 



Rods, vibrations of, 368 



Rose countersink, use of, 658 



Rotating mirror, 397 



Rotation, motion of, 43 ; of a disc in 

 vacua, 45 



Rubbers of electrical machine, 592, 595 



RuhmkorfFs coil, 751 ; effects produced 

 by, 754 



Rumford's photometer, 422 



SALT and ice. freezing mixture of. 831 

 Salts, solutions of, diminution of 

 temperature by, 829 ; chemical de- 

 composition of. 673 



Scale of hardness, 152; of a thermo- 

 meter, 762; for measuring, how to 

 paint, 235 



Scales in music, 349 ; various, of ther- 

 mometers. 762 



Scl erotica, 515 



Screw, 90; cutting, 93; clamp, 55; 

 stock, 93 ; taps, 94 ; propeller, 201 , 303 



Secondary coil, 749 ; current, 749 



Seconds pendulum, how to construct, 58 



Secular magnetic variations, 741 



Segments, ventral, 360 



Separation of the two electricities, 565 



Shadow, 415 



Shock, electric, 626 



Short-sightedness, 517 



Siphon, 251 ; Wurfemberg, 254 ; for 

 objectionable liquids, 254; gauge, 277 



Siren, 345 



TEL 



Size, estimation of, 519 



Smoke-rings, 339 



Soap-bubble solution, 26 



Sodium, spectrum of, 492 



Solar light, analysis of, 504 ; spectrum, 

 504 ; dark lines of, 505 



Soldering, 27 



Solidification, 786 ; change of volume 

 on, 791 ; retardation of, 787 



Solidity, impression of, how produced, 

 534 



Solids, general properties of, 10; con- 

 ductivity of, 813 ; linear and cubical 

 expansion of, 757, 838; molecular 

 coitstitution of, 151 



Solubility, 214 



Sonometer, 355 



Sound, reflection of, 341 ; mode of pro- 

 pagation of, 327 ; velocity of, 333 ; 

 transmission of, experiments on, 335 



Sounding-box, 336 



Space, measures of, 7 



Spangled tube, 602 



Spark, electric, 635 ; length of, 598 ; 

 duration and velocity of, 644 



Speaking-tube, 338 



Specific gravity, 39 ; table of, 837 



Specific heat, 58 ; determination of, by 

 fusing ice, 821 ; by the method of 

 mixtures, 819 



Spectacles, 518 



Spectroscope, 4 7 ; construction of, 498 



Spectrum, 4^-0; analysis, 497; of an 

 incandescent gas in Geissler's tubes, 

 755 



Sphere, volume of, 6 



Spheroidal state, 804 



Spiral, current passing through a, 700 



Spirit-lamps, various kinds of, 15 



Spirit-level, 159 



Stability of bodies, 115 



Stable equilibrium, 105 



Steam-jet pump, 797 



Stereoscope, 533 



Stool, insulating, 609 



Strings, vibration of, 355 



Strontium, spectrum of, 502 



Suction, phenomena of, 301, 309, 797 



Suction-pump, 291 



Sun, analysis of constitution of, 504, 

 513 ; eclipse of, 419 



Sympathetic vibrations, 363 



fTVELEGRAPH, electric, 718 



JL Telescope, astronomical, 525 ; 

 Galilean, 527 ; Newtonian, 532 ; ter- 

 restrial, 526 



