Carpenter, William Benjamin, 1813-1885 · Philadelphia : Blakiston · leaf 165
the Eye-piece in such a manner that the scale maylie across that diameter which it is desired to measure. Thepushing-screw at the extremity of the scale being then turnednntil one edge of the object appears to be in exact contact withone of the long lines, the number of divisions which its… … B
Microscopy · Biology
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