Carpenter, William Benjamin, 1813-1885 · London : John Churchill · leaf 249
the other, interfering with the clearness of the imageformed by medium powers of moderate apertui-e, even whenno special adjustment is made for the aberration they produce (§ 101)- 118. The exact thickness of any piece of glass may be deter-mined without difficulty, by placing it edgeways on the… … Lever of Contact. devised by Mr. Koss for this express purpose. Tliis instru-ment consists of a small horizontal table of brass, mountedupon a stand, and having at one end an arc graduated into 20divisions, each of which represents 1-lOOOth of an inch, sothat the entire arc measures l-50th of an…
Microscopy
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