10 pages matching iris diaphragm in this book
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LOW POWER PHOTOMICROGRAPHY
AN IMPROVISED APPARATUS
11 other sections not shown
achromatic acid amateur apparatus blue botanical preparations bulb camera lens Canada balsam cardboard chitin colour film colour temperature compensating filter condenser cone Contrast filter correct dark-slide degree of magnification depth of focus described diameter diatom dioptres distance draw-tube easel enlarger exposure extension tube eye-piece focal length focusing Gentian violet glued graph ground-glass GUIDE Haematoxylin holder hole insects iris diaphragm lenses light-source llford low-power magnifying glass means metal method of illumination Methyl Methyl green Methyl violet micro microscope miniature camera mirror mounted necessary negative material numerical aperture objective obtained optical bench Orange G panchromatic material paper photograph photomicrography piece placed plane plate camera polarisation position prepared rays removed resolving power reversal film safranin screen screwed sheet short-focus lens slide solution specimen spectacle lens stained strips substage suitable supplementary lens transparency Tungsten ultra-violet usually vertical violet yellow