INDEX 



289 



Printing processes, 227 



for contrast, 229, 257 



Prints, in colour, 203 



Prism vertical illuminator, 196 



attachment for vertical illu- 

 minator, 200 



Projection eyepieces, 72 



adjusting tape for, 73, 152 



Pyro-soda developer, 220, 269 



Quartz objectives for ultra-violet 

 light, 63 



tubes for Mercury vapour lamp, 93 



Radiants, Acetylene (q. v.), 96 



Arc (q. v. ), 85 



candle powers, 101 



- Casing for, 13, 100 



Colour of, 164 



Comparison of, 100 



- and Critical light, 122 



Electric, 85 



and exposure, 173 



Heat of, 84 



incandescent electric, 91 

 gas, 97 



Lantern to enclose, 13 

 optical, 8 



Lilliput arc, 7, 88 



Limelight (q.v.), 95 



Mercury vapour (q.v.\ 92 



- Meta, 98 



- Nernst (?..), 19, 91 



Oil, 99 



- and Critical light, 100 



Petrol vapour, 98 



Selection of, 100 



- Spectra of, 84 



Spirit vapour, 98 



- Stands for, 100 



- Structure of, 84 



Suitability of, 83 

 Ilamsden circle, 119 

 Rectilineal lenses, 130 



Reducers, Farmer's and persulphate, 

 271 



Reduction of negatives, 227 

 Reflecting condensers for dark 



ground, 183 



Reflections in tube, to eliminate, 139 

 Reflector for low-power photo, 128 

 - for enlarging, 232 

 Reflex camera, 5, 13 

 Refractive indices, 49, 276 



of mounting media, 64, 276 

 Reichert's micro- metallograph, 201 

 Resolution and Exposure, 217 



and Grain of plates, 216 

 Resolving power of objectives, 61 



dry and oil objectives, 69 



Limit of, 62 



and N.A., 60 



and ultra-violet light, 63, 176 



and wave length, 61 

 Rodinal, 269 



Root sections, 258 



Rosenhain's metallurgical microscope, 



198 

 Ross mechanical stage, 27 



microscopes, 45 

 Rotifers, 249 



narcotization and mounting, 249 



Saddle stands, 13 



Safelight for Panchromatic plates, 

 236 



for testing Panchromatic plates, 

 237 



Safranin, 265 



Sanger-Shepherd colour screens, 153 



positive, 206 



films, 206 



three-colour process and filters, 



205 

 Screen-plate colour photography, 



209, 273 

 Screens. (See Colour screens) 



for colour photomicrography, 204, 

 208, 210 



for daylight and artificial lights, 

 204 



Focussing, 10 



