460 



INDEX 



Lamp, alcohol or spirit, 382 



arc, fig. of, 72-74 



black for ingestion, 361 



electric, 62 



kerosene and mazda, 61, 74 

 Lantern, for daylight glass and fig., 51 



slides, 182-183 

 Lateral swaying of image, 66 

 Law of color, 253 

 Lens, 10, 280-286 



aberration of, 284-285 



converging, 281 



convex, 281 



eye, 25, 433 



field, 33 



fluorite, 292, 424, 429 



focus on both sides and fig. 12 



history of, 424-429 



holder and fig., 17 



images formed by and fig., 280-284 



paper, bibulous paper, 93 



spherical, 281-283 

 Lettering oculars, 26 

 Letters or figures, mounted, 31 



for drawings, 190-193 



in stairs, no 



white for black back-ground, 192 

 Light, and lighting, artificial, 48-49 



artificial daylight, 49-53, 65 



axial, 46, 65 



central, 46 



dark-ground, 67 



daylight, 45 



direct and central, 45-46 



direct, 45 



electric, 49, 74, 184, 204, 230-231, 

 418-419 



excluder for camera and micro- 

 scope (fig.), 226-227 



experiments, 54 



for developing photographs, 241- 

 242 



for photography and photo-microg- 

 raphy, 209, 222, 228 



incident, 45 



micro-polariscope, 267 



micro-spectroscope, 256 



mirror with, 53-54 



oblique, 47 



polarized light, 264-270 



reflected, 45, 272 



sunlight, 45 



transmitted light, 46 



wave length of, 270 



with kerosene lamp, 54 

 Line spectrum, 250 

 Lintless towels, 315 

 Liquids, currents in, 117 



gelatin, 361 



homogeneous, 438 

 Locker, laboratory or student, 345 

 Longisections, 399 



M 



Magnification, 131, 136 



compensation oculars, 306-308 



determination of, 136 



effect of adjusting objective on, 144, 



. I57 

 eikonometer for, 154, 155 



expressed in diameters or times 

 linear, 131 



initial or independent, 19, 305 



of compound microscope, 4, 46, 132 



of objective, 19, 305 



of photo-micrographs, 228 



of projection apparatus, 1 70, 208, 

 228 



of real images, 133 



of simple microscope, 133-140 



of virtual images, 135 



relation of object and principal 

 focus, 140-142 



table of, 143 



varying with compound micro- 

 scope, 139 



velocity and, 117 

 Magnifier, 7, 16 



tripod, 16 

 Marker for preparations, 100-102 

 Marking negatives, 214 



objects, 197 



preparations, 100-101 

 Masks for preparations, 199-200 

 Mazda gas-filled lamp, 55, 74 

 Measurer for cover-glasses, 318, 319 



