INDEX 



46.3 



Non-adjustable objectives, 77 



thickness of cover-glasses for, 2S6- 

 287 

 Normal liquid, 363 



sail or saline solution, 363 

 Nose-piece, revolving, 2,8-29 

 Numerical aperture and table, 294-297 



Object, determination of form, in 



image, relative size of, 138-139 



micrometer, 135 



mounting, 321 



printing image of direct, 234 



suitable for photo-micrography, 223 

 Objective, 19 



achromatic, 21, 291, 436 



adjustable, 22, 157. 285-287 



adjustment, 77, 157, 229 



aerial image, 31, 33 



aperture, 294, 297 



aplanatic, 21 



apochromatic, 22, 291, 437 



back combination of, 21 



cleaning, 92-93 



cloudiness or dust on, 34 



collar, graduated, 79 



designation or nomenclature, 19-23 



dry, 21 



equivalent focus of, 19, 27 



field of, 29 



focusing for micro-spectroscope, 25S 



front combination, 21 



function of in the microscope, 31-32 



homogeneous immersion and clean- 

 ing, 21, 82 

 experiments with, 81-82 



immersion, 21 



initial magnification, 19, 305 



inverted, real image by, 34 



low and high, 20-23 



magnification of, 10. 131, 305 



micro-polariscope, 267 



microscopic, 19-23 



micro-spectroscope, 257 



names of parts, 2 1 



nomenclature or designation of, 19- 



23 



non-adjustable, unadjustable, 



■57- 



-■-29 

 numbering or lettering, 19 

 numerical aperture, 294-297 

 oil immersion, 21, 295, 438 

 pantochromatii , 22 

 para-chromatic, 22 

 parfocal, 38-39 

 photo-mii rographic, 220 

 proja tion, 201 

 screw thread for, 103-106 

 semi-apochromatii , 22 

 table of field, 20-30 

 terminology or designation, [9 

 unadjustable, non-adjustable, 



157, 285-287 

 variable, 22 



visual and actinic foci in, 222 

 water immersion, 21, So 

 working distance, ,11-40 

 Oblique light, 47, 65-67 

 Oculars, various forms of, 23 



cloudiness or dust on, 03, 109 

 comparison and tig., 123 

 compensation, 24, 26, 292-293 

 concave or amplifier, 420-434 

 designation or nomenclature of, 



23 26 

 equivalent focus, 27 

 eye-point of, 15-33 

 field-lens, 25, 30S-309 

 filar or screw micrometer, 147-140 

 for two observers, 433 

 function of, 32 



Huygenian (fig.), 6, 2-,-2<<, 146-147 

 indicator or pointer. 102. 

 lettering and numbering, 20 

 magnification of, 27, 30S-309 

 micrometer and micrometry, 143- 



[53 

 negative, 23 



pari, 300 



photo-micrography, 220 222. 

 pointer or indicator, 102, 195 



positive, 23 



power or magnification <>f, 26 



projet tion, 201, 220 



