Beck, Conrad, 1864- · London, R. & J. Beck, Ltd. · leaf 35
by sliding the two wedges over each other.This apparatus can be provided with wedges of difEerent intensitiesaccording to the strength of the illuminant with which it is tobe used. The use of a small bundle of oblique light directed upon theobject at a particular angle has been studied in… … Fio. 21.—No. 3328, Double WedgeModerator. ILLUMINATING APPARATUS 33 so that one or more selected beams of oblique light may be used toilluminate the object. An experiment with finely ruled parallellines shows that if a small oblique beam of light is used to illu-minate them at right angles to their…
Microscopy
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