I 12 



Page 



Field, Visible area of object in . 10 

 Finder appliances on mechanical 



stages 36, 38 



Finder MALTWOOD'S 93 



Fluorite systems 7 



Focal depth 11 



Focussing the objectives . . . 40 42 I 



Free working distance ... 8, 16 



Gas lamp, incandescent .... 91 



Glass cell for the Plankton-searcher 2 1 



Glass flask on stand .... 91 



Goniometer oculars 78 



Haemocytometer 81 



Hand-microscope 58 



Hand-spectroscope 91 



Heating stage 92, 93 



HUYGENUN oculars 23, 24 



Illuminating apparatus, ABBE'S . 27, 28 



do. simplified 33 



Illumination by incandescent lamps 25 

 Illuminating system for small 



Stands 33, 34 



Image-erecting microscopes, 



binocular 6065, 109 



monocular 6669, 1 10 



Immersion fluid 10 



Index oculars 88 



Iris-cylinder diaphragms . . . 29, 34 



Iris-diaphragms 29, 33 



do. with ocular 85 



Leather travelling cases . . . 56, 69 



Magnification 



Initial magnification of objectives 14 

 Ocular magnification .... 17 

 Tables of magnification 



for achromatic objectives with 



HUYGENIAN oculars ... 25 

 for apochromatic objectives 



with compensating oculars 19 



Page 

 Tables of magnification 



for paired objectives on bin- 

 ocular stands 26 



for the higher powers of 

 achromatic objectives with 



compensating oculars . . 26 



MALTWOOD'S Finder 93 



Mechanical stage, Large . . . 36, 37 



Small ... 38, 39 



Metal plate with name engraved 69 



Mica films 85 



Micro-burner 92 



Micrometer oculars 7(J 



Micrometer movement . . . 40 42 



Microscope lamp 91 



Microscopes , Complete outfits , 



for bacteriological research . 100, 103 

 for histological, zoological and 



botanical research . . . 100, 104 

 for mineralogical and cystallo- 



graphic research .... 106 

 for chemical laboratories, apo- 

 thecaries, breweries, dairies, 



paper and celluloid factories 107 



for beginners' courses . . . 105, 106 



for Customs House .... 108 

 for opaque objects, metal 



specimens etc 108 



for travel 56, 103 



for Trichinae 58 



Micro-spectral objective ... 32 



Micro-spectro-photometer . . 88 



Micro-spectroscope 87 



Microtomes 95 



Name, Engraving of, on stand . 69 



Numerical aperture 11 12 



Nose-pieces 43, 44 



Objectives 



Achromatic 2023 



Apochromatic 12 15 



Paired for binocular stands . 23 



