848 



INDEX. 



TEM 



Temperature, 756 ; correction for, in 

 barometers, 781 ; influence of, on 

 specific gravity of gases, 783 



Tempering, 97 



Tension, electrical, 586 ; maximum, of 

 electrical machine, 599; of aqueous 

 vapour, 799 



Terrestrial magnetism, 740 ; telescope, 

 526 



Test-tubes, how to graduate, 38 



Thallium discovered by the spectro- 

 scope, 504 



Thermal unit, 817 



Thermal effects of electricity, 629 



Thermometers, 760 ; division of scales, 

 762 ; determination of fixed points, 

 765 ; displacement of zero, 769 ; 

 alcohol, 761 



Threads of a screw, 90 



Timbre, 355, 368 



Tissue-paper, thickness of, 1 



Tone, 344 



Tonic, 350 



Tools for drilling, 97 



Torricellian vacuum, 238 



Transferring liquids from one vessel 

 into another, 27 



Translucent bodies, 414 



Transmission of heat, 809 ; of pressure, 

 161 ; of sound, 326 ; of electricity, 559 



Transparency, 413 



Triangle, area of, 3 



Tube, spangled, 602 



Tubes, Geissler's, 638, 754 ; vibration 

 of air in tubes, 385 



Tuning-fork, S74 



Turbine, 204 



Tweezers, 28 



TTMBRA, 415 



U Undulations of light, 410 

 Units of length, 7 ; of area, 7 ; of 

 volume, 7 ; of heat, 817 ; of work, 73 

 Unstable equilibrium, 105 



TTACUUM of an air-pump, 277; 

 V formation of vapour in, 833 ; Tor- 

 ricellian, 238 



Valves of pumps, 291 



Vaporisation,792; latent heat of, 823,825 



Vapour, aqueous, tension of, 799; for- 

 mation in closed space, 796; latent 

 heat of, 823; determination of latent 

 heat of, 825; saturated, 807; non- 

 satiirated, 808 



Variations of height of barometer, 234 ; 

 of terrestrial magnetism, 741 



Velocity produced by a definite force, 



ZOE 



52 ; of electricity, 644; of sound, 333 ; 

 of light, 410 



Ventral segment, 360 



Vibration, arc of, 126 ; time of, 345 



Vibrations of rods, 368 ; of bells, 370 ; 

 of strings, 355 ; of air in tubes, 385 ; 

 of plates, 368 ; measurement of num- 

 ber of, 345 ; of notes, 345 ; of pen- 

 dulum, 123 



Vice, 56 ; parallel, 57 



Virtual images, 440 ; velocities, princi- 

 ple of, 85 



Vision, distance of distinct, 519; bi- 

 nocular, 533 



Visual angle, 519 



Vitreous humour, 516 



Vocal ligaments, 391 



Voice, the human, 390 



Volume, unit of, 7; determination of, 

 4 ; of solids, 5, 6 ; change of, on 

 solidification, 791 



Vowel-sounds, 392 



TT7ASHING-BOTTLE, 36 

 VV Water, decomposition of, 677; 

 maximum density of, 778 



Water-hammer, 788 



Wave of water, 328 ; of sound, 330 ; 

 stationary, 375 ; progressive, 375 



Wedge, 89 



Weight, 34; absolute, 34; specific, 39; 

 determination of, 40, 190; units of, 

 34 ; of air, 220 



Weights, casting and preparing, 35 ; 

 raised by liquid pressure, 182 



Wheel and axle, 80 



Wheel of life, 547 



Whirl, electrical, 605 



Whirling-table, 132; experiments by 

 means of, 135 



White light, decomposition of, 480 



Wind, electric, 604 



Winds, cause of, 785 



Wine-taster, 256 



Winter's electric machine, 593 



Wire frames, how to construct, for co- 

 hesion figures, 28 



Wood's fusible alloy, 790 



Work, mechanical, 46, 72 ; measure of, 

 73 ; experiments on, 74, 75 ; accu- 

 mulated, 78 



'TERO of thermometer, 762 ; displace- 



/J ment of, 769 



Zinc-copper element, 655; battery, 654; 

 -carbon battery, 663 ; -platinum bat- 

 tery, 660 



Zoetrope, 547 



