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 



