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 



