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INDEX 447 PHO RIN Photochromoscope, 436 Photographic slides, 136 Photography, 247 ; colour, 435 Physiological demonstration, 230 Piles of glass for polarising, 340, 345, 351 Pillar-stands, 174 Pinhole, experiments with, 3, 6 Place's lime-turning arrangement, 64 Plane mirror, 175 Plaster surface as a screen, 124, 200, 208 Plateau's experiments, 226; soap solution, 325 Plates, perforated, for diffraction, 337 Plug dissolving tap, 108 Polarisation, plane, 349; circular, 362 ; rotary, 365 ; of heat, 393 Polarised light, 349 ; and common, 352 Polarising apparatus, 338 — miscroscope, 201 Polarity, magnetic, 394 Pond life, exhibiting, 204 Portable screens, 126, 131 Prazmowski's prism, 340 Precautions against explosions, 55, 59 Precipitations, 243 Preparation of gases, 73 Press for straining glass, 360 Pressure of gas in bags, 53, 58; in cylinders, 84 Pressure-boards, 44, 55 Pressure-gauge for testing gas- cylinders, 85 Pressure-regulators, 86 Pringle's cut-off for jets, 117 Printed diagrams, utilisation for the lantern, 414 Prisms, action of, 4, 281; achro- matic, 291; compound and direct, 293 ; dispersive, 175, 282, 293 ; double-image, 349 ; Fres- nel's, 332, 376; Nicol, 339; Ahren's improved, 345 ; polaris- ing, 339, 344, 349 ; wedge-form, $81, 286 Projection : definition, 1; of ap- paratus, 212 ; by shadow, 216 Projection microscope, 179, 431 Propagation of waves, 321 Proportions of gases burnt, 52 Pulse, movement of, 233 Pumice safety chambers for jets, 93 Purifying oxygen, 78 QUARTER-WAVE plates, 364, 367 Quartz in polarised light, 370, 372 HACKWORK slides, 142 Eadiant, the, 34 Radiant heat in spectrum, 391 Radio-micrometer, the, 393 Rainbow, the, 289 Rain-effect slide, 143 Rays form images, 1; management of, 11 Reactions, chemical, 243 Reade's iridescope, 331 Recomposition of light, 285 Reed apparatus for projecting Lissajous' figures, 262 Reflecting mirror, use of, 256, 277; polariscopes, 232, 237, 261, 338, 346 Reflection of light, 274; angle doubled in, 277 ; total, 279 Refraction, 4, 278 ; by prisms and lenses, 281; double, 349 Refulgent petroleum lamp, 37 Registration of slides, 104 Regulators for gas-cylinders, 86 Reinold and Riicker on films and currents, 408 Retorts for oxygen, 75 Reusch's artificial quartz, 382 Reversed spectrum lines, 310 Revolving mirrors, 270; lenses, 270, 400 ; polariscope, 371 Rhigoline for O.-H. light, 95, 100 Rings, Newton's, 328, 353; wire for soap-films, 225, 326 Rings and brushes in crystals, §76