INDEX 



291 



Swift's apochromatic condensers, 110 



Premier microscope, 37 



Tal>le for camera and optical bench, 



21 



Tabloid developers, 220 

 Tank development, 132, 223 

 Tape for projection eyepieces, 152 

 Telephoto lens, 139 



extension with, 140 



Tenth metre, 158 

 Test objects, 57 



- Diatoms as, 57, 178 



Amphipleura, 257 



Navicula, 255 



- Pleurosigma, 256 

 Thames colour plate, 211 

 Three-colour photography, 204 



for bacteria, 241 



- Dyes for, 207, 273 



- Exposures for, 205 



- Filters for, 205 



positives, 206 

 Time development, 222 

 Toning lantern slides, 235 



- blue solution for transparencies, 

 273 



P.O. P., 272 



Transmission of filters, 154, 159 

 Transparencies in colour, 203 

 Transparent objects, low-power, 133 

 Traviss' expanding stop, 180 

 Triceratiumfavus, 255 

 Tricolour process. (See Three-colour 



process) 



Tripod, foot, 26, 45 

 Troughs for liquid niters, 160 



- Kingsford, 13 

 Tube diameter, 35 



- Wide, 139 



- length, 34, 70 



and cover-glass thickness, 70 



and magnification, 77 



Mechanical, 70 



- Optical, 76 

 Turbidity factor of plates, 216 



Two-colour process, 208 



- for bacteria, 241 



Ultra-microscope, 185 



Ultra-violet light for photomicro- 

 graphy, 63 

 and resolution, 63, 176 



Universal cameras, 17 



condenser, 109 



Van Heurck camera, 15 



microscope, 39 



Verniers on stage, 27, 143 

 Vertical cameras. (See Cameras) 

 - for solid objects, 250 



- illuminators, 195, 196 



Prism attachment, for, 200 

 Vibration, prevention of, 21, 23 

 Victol, 269 



Violet light and resolution, 61 



Wales microscope stand, 37 

 Water immersion objective, 67 

 Watson's camera, 11 



- Conrady condenser, 13, 105, 124 



Holoscopic eyepieces, 74 



microscopes, 39, 43 



paraboloid, 184 



substage condensers, 109 

 Wave length units, 158 



Weights and measures, English and 

 metric, 274 



Wenham's paraboloid, 179 



Westminster enclosed arc, 90 



Wheel stop, 180 



White light, disadvantages of, 153 



Wide angle cone of light and conden- 

 sers, 109 



and objectives, 67 



for bacteria, 241 



Wid:>. tube, 139 



Working aperture, 111 



distance, 65 



and N.A., 65 



Workroom, 22 



Wratten's colour screens, 156, 267 



