Angles, of reflection, 27; of total reflection, 54; of polarisation, 222; of bi-axial crystals, 319 Anomalous dispersion, 81, 85, 107; in crystals, 314, 320 Apophyllite rings, 314 Apparatus, 1-21; polarising, 242; for bi-axial crystals, 249, 316 Arragonite, conical refraction in, 324 Artificial quartz preparations, 303; uni-axial crystals, 313, 329; Nicol prisms, 257
Artists, mistakes of, 75, 121 Axes, optic, 226, 231, 325; relation of, 326, 338
BALMAIN'S paint, 144
Balsam and bezol, for mounting, 264
Bands in spectrum of Newton's rings, 172; mica, 173; selenite, 268; quartz, 286 Barton's buttons, 190 Becquerel on phosphorescence, 151 Bi-axial crystals, 231,315; apparatus for exhibiting, 249, 316; theory of, 321
Biot's experiment on sonorous vibra- tions, 278
Bi-quartz, 286, 288
Bi-sulphide prisms, 16, 84 -
Black surfaces, polarisation by, 346 Blue and yellow, variety of effects from, 123
Brewster on the polarising angle,
223; his artificial crystals, 313 Brookite, peculiar dispersion of, 321 Brücke on polarisation by small particles, 345
Bunsen's holder, 16
CALCITE, 208 Calorescence, 150 Camera obscura, 22 Care of calcite prisms, 252 Cascade, luminous, 55 Cauchy on dispersion, 108 Change in wave-length, 141 Chemistry, solar and stellar, 138 Chlorophyll, phenomena of, 114, 148 Chromatic aberration, 70
Circular double-refraction, 284, 292
Circular polarisation, 294; effects on crystal figures, 333
Clock, polar, 344 Collimator, use of, 84 Colour, III; caused by suppression, 72, 112, 159; absorbed, reflected, and transmitted, 114; only a sensation, 118, 124 Colour-blindness, 127 Colours, not primary, 123; com- plementary, 116; of thin films, 158; of thick plates, 207; of polar- ised light, 260, 286 Combinations of mica and selenite, 328
Common light, theories of, 234 Complementary bands in spectrum of polarised light, 268, 286 Complementary colours, 116, 260, 286
Composite crystals, 326
Composition, of colours, 71; of vibrations, 295 Conical refraction, 324 Conservation of energy, 153 Continuous spectra, 131
Convergent rays in crystals, 309
Cord, displacement of, analogous to light, 239
Cornu's saccharometer, 289
Crossed crystals, 328; mica films, 329
Crossing films, effects of, 266 Crova's disc, 96 Crystallisations, 269; on the screen, 273
Crystals, uni-axial, 226, 230; bi-
axial, 231, 315; rotatory, 290; composite, 326; irregular, 327; crossed, 328; rings and brushes in, 308; in circular light, 333; spirals in, 337 Crystal stage, 311 Cylindrical lens, 72
DE DOMINIS, experiment on the rainbow, 78
Deflection of rays, 57 Delezenne's analyser, 207
Descartes on the rainbow, 80 Designs for polarised light, 263 Deviation, minimum, in prism, 59 Diagrams for lantern, 18 Diffraction, 182; spectra, 191; in the microscope, 200 Direct vision prisms, 83 Direction of vibrations in polarisa- tion, 224; in common light, 234 Disc, Crova's, 96; Newton's, 73 Dispersion, 66, 107
Dispersion, anomalous, 81, 85; crystals, 314, 320 Dolbear's opheidoscope, 39 Doubled angle of reflection, 31 Double-image prisms, 209
Double refraction, 208; analysed,
Foucault's experiment on velocity of light, 90; his prism, 251 Fox, on diffraction patterns, 185; on mica preparations, 264, 305 Fraunhofer's lines, 132, 136 Fresnel, on transverse vibrations, 217, 235; his theory of common light, 235; his mirrors, 178; his prism, 179; his quartz prism, 284; his rhomb, 295; on quartz, 284; on rotatory polarisation in fluids, 292 Fuchsine, anomalous dispersion of, 85
GASES, spectra of, 130; of in- candescent, 133 Gas-burner in lantern, 4 Gas-regulators for lime-light, 9 Geological sections polarised, 273 Glass in sonorous vibration, 278 Glass piles, 215, 252 Goldleaf, colours of, 115 Gratings, 183
Green, not a compound, 118 Grey, nature of, 75
Gypsum, effects of heating, 321
HAMILTON on conical refraction, 324
Heat, effects of, 276, 322; identical
with light, 142, 350; its vibrations visible, 33 Hemitrope crystals, 327 Herschel, on polarisation of the sky,
345; on reversal of phase in re- flected light, 195; right and left handed crystals, 284; on a stretched cord, 241; on water- colour painting, 121 Hoffman's arrangement for bi-axials, 317
Huyghens' construction of waves,
IOI; experiment, 210; on double refraction, 217 Hyperbolic curves, 170, 328
Identity of light, heat, and actinism, 142, 350
Images, 22; from mirrors, 29, 41; from lenses, 61; virtual, 28, 43, 62 Indices of refraction, 52, 230 Intensity, law of, 27 Interference, 154; conditions of, 158 Interference bands in spectrum, 172, 268, 286; in analysis, 282 Inverse squares, law of, 27 Inversion of images, 25, 42, 62 Invisibility, of polished surfaces, 45; of light, 46
Invisible rays, 141
Iodide prism, 83
Irregular crystals, 327
Irregular refraction, 181
Isolating phenomena, need for, 24, 78, 173
Ivory balls as illustrating waves, 94
JAMIN'S prism, 257 Jellett's analyser, 289
KALEIDOPHONE, 37 Kaleidoscope, 31
Kundt on sonorous vibrations, 281
LANTERN, I; vertical attachment, 19; mounting, 12; diagrams, 18 Lantern polariscope, 4, 253 Lenses, 60; achromatic, 83; mount- ing, 14
Light, for optical experiments, 4; centering, II; invisible, 46; a mode of motion, 91; theories of, 88, 91, 94 Lime-light, 6
Line spectra of gases, 133 Lines, Fraunhofer, 132, 136 Lines, thickened, 137
Lippich on common light, 238 Liquid waves, 155
Lissajous' experiment, 34 Lloyd on conical refraction, 324 Lockyer, on transmission of states, 93
Lommel on fluorescence, 148 Lycopodium, diffraction by, 186
MACH, on sonorous vibrations, 281 Magnesium light for fluorescence, 147
Magnetic rotation, 290 Matter, possibly vortices in the ether, 355
Measurement, of wave-lengths, 192; of molecules, 196
Mechanical illustrations, of undulat- ory theory, 108; of polarisation, 219
Metals, reflection from, 299 Mica, bands in spectrum of, 173, 268; designs in, 263; artificial uni-axial crystals of, 303, 329; work with films, 305; quarter- wave plates, 297; combinations with selenite, 328 Microscope, bi-axials in the, 318; diffraction in the, 200 Micro-slides, 250, 272
Mirrors, concave, 40; convex, 43; reflecting, 37; Fresnel's, 178 Mistakes of artists, 75, 121; of the eye, 118, 125
Mitscherlich's experiment, 226,322 ; his saccharometer, 289 Mixed plates, 181
Mixtures of light and pigments, 118 Molecular constitution, 197, 291 Molecules, size of, 196 Mother-of-pearl, 188
Motion, light must be, 91; a form of, 352; a revealer of, 152 Mounts for lenses, &c., 13 Multiple images, 29, 59
NARROW slit, need of, 77 Natural colours residual, 115 Nature and her Author, 354 Newton's experiment on the spec- trum, 65; in total reflection, 67; colour-disc, 74; rings 166; analysis of, 170
Nicol prisms, 243; care of, 252; artificial, 257
Nobert's gratings, 184, 197 Normal, the, in optics, 28 Norremberg's artificial mica-film uni-axial crystals, 329; doubler, 255; lenses for bi-axials, 317; mica and selenite combinations, 328
OBJECTIVE for optical lantern, 2 Oil-lamps, for lantern, 6 Opheidoscope, 39
Opposite rotations, 284
Optic axes, 226, 231, 325; relation of, 326, 338
Organic substances, 273 Oxide, colours in film of, 160 Oxygen, for lime-light, 7
P. ANGULATUM, effects of, 204 Particles, small, as polarisers, 345 Pendulum, experiments with, 295 Perforated cards, experiments with, 186
Persistence of vision, 73
Phase, reversal of, 195, 262 Phoneidoscope, 174 Phosphorescence, 144
Pillar-stands for apparatus, 13 Pigments, mixtures of, 118 Pincette, tourmaline, 311
Plane of polarisation, direction of vibrations in, 224
Plateau's soap solution, 162 Polar clock, 344
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