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448 OPTICAL PROJECTION RIP Ripples and waves in fluid, 222, 249 Bearing in jets, 61 Bods, vibrating, 251, 266, 362 Boget's spiral, 404 Boiler-slides, 143 Botary polarisation, 365 Botating frame, 348 — polarised beam, Prof. Thomp- son's method, 347 Botation, optical, right and left- handed, 373 ; in fluid, 381; mica register for, 374; electro-mag- netic, 375 ; of common light, 376 Botational colours, 366 Botator for polarising objects, 348 Bowland's, Professor, diffraction gratings, 336 SACCHAROMETER, 375 Safety with the O.-H. light, 55, 59 Safety jets, 47 ; adjusting, 50 Saponine, properties of, 227 Saturators, 421 Scattered reflection of light, 274 Scattering of rays, 30; in the mi- croscope, 184 Schroeder's projecting microscope, 181 Sciopticon, the, 36 Scott's oxy-carbon light, 100 Screens, 124, 200 ; sizes of, 127 ; erecting, 128, 131 Screw-table for arc-lamps, 166 Scrolls, acoustic, 256, 263 Sea-waves, representation of, 142 Sector-plates, mica, 367, 374 Selenite, in polarised light, 352, 379 Sensation of colour subjective, 297 Sensitive flames and jets, 270 Serrin-Suisse arc-lamp, 162 Shadow projections, 216 Sheet, mounting of a, 128 Siemens' arc-lamp, 163 Silver screens, 425, 427 Size of condensers, 23 ; of objec- tives, 31; gas-cylinders, 84 STE Sleeman, Bev. P. B., an I reflecting polariscopes, 346; spectrum reversals, 312 Slide-stage of a lantern, 24, 104 Slides, 136; carriers for, 137; effects, 140; marking, 117; registration of, 104; preparation of diagrams, 411; microscopic, 202 Slipping slides, 141 Slit and spectrum, 282, 289 Small particles, polarisation by. 382 Snapping in jets, 48, 52, 59, 100 Snow effect slide, 143 Soap bubbles and films, 225, 326 ; solutions for, 325 Sodium-line, the, 308, 311, 313 Solar system, slides for, 142 Solenoid, pull of a, 406 Solutions of soap, 325 Sonorous vibration and polarised light, 362 Sound, 247 ; and polarised light, 362 Specific heat, 389 Spectra, continuous, 304; absorp- tion, 305; bright lines, 306: reversed lines, 310 Spectrum, the, 282, 304; the in- visible, 315 ; heat in, 391 Spherical aberration, 19, 26 Spheroidal state, 390 Spirals, Airy's, 379 ; Wright's, 380 Spirit-jets for lime-light, 46 Spot-lens, 201 Spottiswoode's revolving polari- scope, 371 Sprengel pump, 229 Springs, vibrations of, 266 Stands for the lantern, 132; for apparatus, 175; pillar for ac- cessories, 174 Star dissolving tap, 107 Starting an exhibition, 113 Static charges and induction, 396; electrical stress, 398; discharge, 399 Statuary, exhibiting, 123 Stereoscope, lantern, 438