INDEX 



449 



STO 



WEI 



Stohrer's lantern galvanometer, 

 401 



Strains, molecular, 229 : in po- 

 larised light, 360 



Stress, static electrical, 398 



Striated surfaces, 335 



Superposition films, polarising, 

 356 



Suppression the cause of colour, 

 285, 324 



Surface tension of liquids, 224 



Sympathetic vibrations, 253 



TABLE, work upon a, 176 

 Talbot lines in spectrum, 331 

 Tanks for ether light, 92, 95 

 Tanks and troughs, 223, 226, 228, 



241 ; for microscope, 204 

 Taps, dissolving, 106 ; four-way, 

 121 ; lubricating, 109 ; for house- 

 gas, 44 



Telescopic draws, objection to, 32 

 Tension, surface, 224, 226 

 Testing cylinders for gas, 85 ; gas- 

 pressures, 54 ; objectives, 32 

 Test-tubes, 243, 387 

 Theatres, experiments in, 178 

 Thermo-electricity, 407 

 Thermopile, use of, 389, 391 

 Thicknesses, wave, in mica, 356 

 Thick-plates, colours of, 332 

 Thin films, colours of, 324 

 Thomson, Mr. J., and polarisation 



by small particles, 383 

 Thompson, Prof. S. P., on arc- 

 lamps, 163 ; polarising prisms, 

 340; mica apparatus, 347, 374; 

 galvanometer, 401 

 Three-way tap, 106 

 Tinters for lanterns, 122 

 Tornlinson's cohesion figures, 228 

 Tongs for limes, 71 

 Top of a lantern, 16 

 Torque, optical, 374 

 Total reflection of light, 279 

 Tourmalines, 340, 350 

 Tracing-paper as a screen, 127 

 Transparency, nature of, 294 

 Transparent screens, 127, 132 



Transparent objects in the micro- 

 scope, 202, 203, 211 



Trevelyan's rocker, 251 



Triple dissolving, 120 



Triplet objectives, 28 



Tripod stands, 176 



Tri-unial lanterns, 118 ; for phy- 

 sical demonstration, 160 



Troughs, 223, 226, 241 ; for micro- 

 scope, 204 



Tubing for gas, 45 



Tuning-forks, 253 



Turpentine, film of, 324 



Tyndall's phosphoroscope, 321 



UKANINB, fluorescence of, 318 

 U -tubes, use of, 54 



VAPOUR, rings of condensed, 331 

 Varnish for slides, 414 

 Vertical projections, 166, 226 

 Vibration of rods, 251, 266 ; forks, 



253; strings, 266, membranes and 



plates, 268, 273 ; columns of air, 



273 ; sympathetic, 253 

 Vibrations, composition of, 362 

 Vice for acoustic experiments, 



252 



Viscosity, 227 

 Vortex-rings, 229 

 Vortices in soap-films, 272, 328 



WASH BOTTLES, 78 



Water, pure and hard, 245 ; decom- 

 position of, 408 



Wave-motion, methods of demon- 

 strating, 248, 321 



Waves, interference of, 322 



Wave-slides, 321 



Wave-thicknesses in mica, 356 



Wedge-prism, 281, 286, 329 



Wedges, mica, 355, 370 ; to show 

 Newton's orders of colours, 356 



Weights, dangers from, 53, 56 



Weinhold, Prof., arrangements for 

 tuning-forks, 258 ; achromatism, 

 G G 



