Carpenter, William Benjamin, 1813-1885 · Philadelphia : Blakiston · leaf 165
B … Jacksons Eye-piece Micrometer. made quite exact enough for all ordinary purposes, provided, in■the first place, that the Eye-piece scale be divided with a fairdegree of accuracy ; and secondly, that the value of its divisions beascertained (as in the case of the Cobweb Micrometer) hj…
Microscopy · Biology
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