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442 OPTICAL PROJECTION BOB CUR Bores of jets, 62, 98, 101 Box or cabinet, the, 134 Boys, Mr. C. V., and Cavendish ex- periment, 220; revolving lenses, 270, 400 ; radio-micrometer, 3 ( J3 Bright lines, mixtures for pro- ducing, 309 Brightness of image, 8 Brin's oxygen process, 88 Brockie's optical arc-lamp, 163 Broughton's oxy-ether light, 92 Browning model lantern, 158 Brushes in crystals, 376 Bubbles, soap, 225, 326 Bunsen's photometer, 294 ; sodium absorption apparatus, 315 Burner for line spectra, 307 Bye-pass, nature and use of, 107 CABINETS for the lantern, 133 Calcite prisms, care of, 344 Calorescence, 315 Capillarity, 222, 407 Capillary electrometer, 240, 408 Carbons, inclined, 164; for spec- trum experiments, 312 Cardioscope, Czermak's, 236 Carriers for slides, 137 Cascade, luminous, 280 Cavendish experiment, 220 Centering the light in a lantern, 115, 152 Centrifugal force, 221 Charges, static electrical, 396 Chemistry, 241 Chimney of a lantern, 16 Chladni's figures, 272 Choreutoscope, the, 145 Chromatrope, 142 ; optical, 368 Cinnamic ether for prisms, 293 Circular polarisation, 363 Circulation, of blood, 205, 230 ; of protoplasm in Vallisneria, 200 Clarkson's regulator, 87 Cleaning lenses, 102 Cleminshaw, Mr.E., on line spectra, 307, 313 Cloth-bodied lanterns, 17 Cohesion, 221; figures, 228 Colour, a shadow or suppression, 285,324; refraction various, 283; a subjective sensation, 297 Colour photography, 435 Colours, composition of. 285; ab- sorption, 299; complementary, 301; composite, 302; pure, 303 ; interference, 324; of polarised light, 353 ; rotational, 366 Coloured designs for polarised light, 354 Combustion-lantern, 308 Comic slides, 140 Common light, rotation of, 376; and polarised, 352 Complementary colours, 301 Composite colours, 302 Composition of vibrations, 362 Compound microscope, projection with a, 190 Compressed gases, 82; manage- ment of, 89 Concave amplifiers, 186, 344 Condensers, use of, 8; position of, 10; various, 17 ; corrections, 19, 21; practical points in, 22 Conductivity (heat), 388 Connections of a bi-unial, 108,114 Contrast, effect on colour, 298 Convection currents, 387 Convergent light in crystals, 376 Correction of condensers, 19 ; of objectives, 27 Crossed films, polarising, 355 Crossing of rays, effects of, 12 Crova's disc, 248 Crystallisation, heat of, 389; on screen, 229, 358 Crystallisations, polarising, 202, 357 Crystals, rings and brushes in, 376; artificial, 381 Crystal-stage for polariscope, 343, 377 Current electricity, 400 Currents, action of electrical, 403 ; in animal tissue, 239 ; continu- ous or alternating, in demon- stration, 165; and capillarity, 407