Beck, Conrad, 1864- · London, R. & J. Beck, Ltd. · leaf 38
not be illuminated at all (see Fig.24), whereas with an ordinary condenser, even if the object isnot in the exact focus, it will stiU be illuminated, though, perhaps,not so brilliantly. The non-focussing dark-ground illuminatorhas no adjustment; as the front portion of the illuminator mustbe in… … Fig. 24.—No. 3294, Focussing Dark-ground niuminator. ness can be selected for examining living specimens, bat mountedobjects can seldom be examined. To overcome this difficulty, R. & J. Beck, Ltd., have designed Focussingthe dark-ground illuminator (Figs. 24 and 25) with a focussing…
Microscopy
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