Beck, Conrad, 1864- · London, R. & J. Beck, Ltd. · leaf 29
it brilliantly and to vary the characterof the illumination. There are three difierent kinds of substage condensers. Thesimple so-called Abbe condenser consists of two lenses with aniris diaphragm close behind the back lens and a tray below forthe insertion of patch-stops or colour filters, as…
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