Carpenter, William Benjamin, 1813-1885 · London : John Churchill · leaf 189
focal adjustment; this being the Adjustment of theObject-glass itself, which is requiied to neutralize the disturb-iag effect of the glass cover upon the cou.rse of the rays pro-ceeding from the object (§ 15). For this adjustment, it willbe recollected, a power of altering the distance between… … Section of an Adjusting Object-Glass. slides over an interior tube (b) by which the other two pairsare held; and it is drawn up or down by means of a collar (c),which works in a furrow cut in the iimer tube, and upon ascrew-thread cut in the outer, so that its revolution in theplane to which it is…
Microscopy
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