318 



INDEX 



Magnification, 193 ; of dry-lens, 19 ; 

 of objectives and oculars, 26, 34, 

 35, 193, 194, 197; of oculars, 40; 

 of projection- oculars, 41, 195 ; 

 of object, to determine, 27, 198 ; 

 calculation of, approximate, 195, 

 by micrometer, 196 ; with ultra- 

 violet light, 252 ; in metallurgical 

 work, 264 ; in bacteriological work, 

 273 



Manganese sulphide in steel, 304 



Martens' metallurgical microscope, 

 259 



Mees, Dr. Kenneth, Atlas of absorp- 

 tion-spectra, 218 ; on resolving 

 power of plates, 221 



Mercury-vapour lamp, 91 ; its spec- 

 trum, 92, 214; Baker's, 93, Swift, 

 94 ; connecting up, 94 ; quartz 

 tubes for, 94, 154 ; method of 

 using, 168, 181 ; colour-screens 

 for, 92, 214, 218 



Metal- filament lamps, 88 ; difficulty 

 from small area, 107, J. W. Gordon's 

 device to overcome, 107 



Metal-surfaces, illumination of, 61- 

 69, 141, 256, 261, 264, 267, vide 

 also Opaque objects ; colour screens 

 for, 267 ; microscopes, Ri/sen- 

 hain's (R. & J. Beck) 259, Stead's 

 (Swift) 263, Zeiss, 256, Martens' 

 model (Zeiss) 259 ; Leitz Micro- 

 metallograpa, 142, 144; rotating 

 stage necessary, 8 ; coloured glass 

 screens (Rosenhain), 261 ; expo- 

 sure for, 264 ; focussing for, 256, 

 267 ; magnification for, 264 ; 

 preparation and mounting of speci- 

 mens, 24, 265, 266 ; coloured 

 lantern-slides for, 277 



Metallography, improvements due 

 to, 61 ; books on, 265 ; vide Metal 

 Surfaces 



Methyl green, 212 



Methyl violet, 214, 298 



Methylene-blue, 200, 213, 295-297, 

 299, 302 



Metol-hydrokinone, 230-232, 240, 242, 

 284, 287, 295 



Metric measures, 305 



Micrometallograph (Leitz), 142, 144 



Micrometer to measure magnification, 

 196, 252 ; quartz, 255 



Micromiliimetre (/x/i), S05 

 Micron (/i), 305 



Microscope, preliminary adjustments 

 of, 146 ; position relatively to 

 camera, 112, 188; connection to 

 camera, 178 



Microscope stands, English and Con- 

 tinental, 5 ; choice of, 6, 9 ; 

 desiderata in, 6-8; D.P.H. 

 (Baker), 14; Leitz, 14; Reichert, 

 17 ; Research (Swift), 14 ; Royal 

 (Watson), 14; Van Heurck (Wat- 

 son), 11 ; Wales type (Swift), 9 ; 

 Zeiss, 11, 256; Rosenhain 's metal- 

 lurgical (Beck), 259; Stead's 

 metallurgical (Swift), 263; Mar- 

 tens' metajlurgical (Zeiss), 259 



Microsporon audouini, 297 



Micro-Summar lens, 33, 184 



Mirror as sub-stage condenser, 47 



Mixed-jets, vide Lime-light 



Monkey, medulla of, 289 



Monobromide of naphthaline, 19 ; 

 refractive index of, 306 



Monochromatic light, 21, 27, 92, 302 ; 

 from mercury- vapour lamp, 214 ; 

 spectroscopic apparatus for (Baker), 

 214; filters (Wratten and Wain- 

 wright), 217 ; resolution by, 216 



Monochromatic objectives, 27, 251 



Mounting of objects, 24 ; for ultra- 

 violet light, 255 ; of metal sped- 

 mens, 265, 266 



NAPHTHOL-green, 212, 298 

 Navicuta lyra, 294, 300 ; rhomboides, 



302 



Negative development, vide Develop- 

 ing 

 Nelson, E. M., collecting-lens system, 



70, 169, 284 



Nernst lamps, 88-90, 169 ; actinic 

 value of, 226 ; ' Luna ' type, 90, 

 165 ; Projector type, 91 ; connec- 

 tions for, 90 ; with Zeiss parabo- 

 loidal condenser, 58 

 Newman and Guardia, binocular 

 focussing-glass, 187 ; reflex camera, 

 295 



Nose-pieces, 34, 36, 37, 163 

 Numerical aperture of objective, 21, 

 25 ; importance of, 22, 25, 

 26, 31 ; means of reducing, 

 22 ; in relation to resolving 

 power, 21, 25, 26, 31, 161, 

 Abbe's law, 215; as affecting 

 penetration, 22-24, 194; pro- 

 portion utilised, 162 ; as de- 

 termining exposure, 223; Dr. D. 

 J. Reid 's method of measuring 

 working value, 224 ; exact 

 determination of, by Abbe 

 apertometer, 307, by Cheshire 

 apertometer, 309 



