. On microscopical manipulation : being the subject matter of a course of lectures delivered before the Quekett Microscopical Club, January-April, 1869. both makers is precisely similar. The objects to beviewed with this illuminator should be uncovered,otherwise the cover refledls nearly the whole of thelight, and scarcely any falls upon the objedt; somelight is also lost by reflecSlion on its passage upwardsthrough the oblique unsilvered mirror. The impossi-bility of obtaining a satisfadtory view of a coveredobje(5t will most probably prevent this instrument fromcoming into very general use,
. On microscopical manipulation : being the subject matter of a course of lectures delivered before the Quekett Microscopical Club, January-April, 1869. both makers is precisely similar. The objects to beviewed with this illuminator should be uncovered,otherwise the cover refledls nearly the whole of thelight, and scarcely any falls upon the objedt; somelight is also lost by reflecSlion on its passage upwardsthrough the oblique unsilvered mirror. The impossi-bility of obtaining a satisfadtory view of a coveredobje(5t will most probably prevent this instrument fromcoming into very general use, although it affordsvaluable information to those who will take thetrouble to master the difficulties attending its use. SUB-STAGE ILLUMINATORS. 105 The second class of illuminators, those which areplaced beneath the stage, are also very most familiar is the mirror, which forms a partof every microscope. A great variety of illuminationmay be obtained from the mirror alone, if properlymounted so that it may be turned considerably mirror of many microscopes is now placed on adouble-jointed arm, which permits very oblique illu-
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Keywords: ., bookcentury1800, bookdecade1870, booksubjectmicroscopy, bookyear1
