Micrographia : containing practical essays on reflecting, solar, oxy-hydrogen gas microscopes; micrometers; eye-pieces, &c. &c. (1837)
Goring, C. R., 1792-1840, Pritchard, Andrew, 1804-1882, joint author · London : Whitaker and Co. · leaf 197
h half that power will be * I find, with this medium, that a slight obliquity produces double re-fractiou. 184 THE MICROGRAPHIA. found amply sufficient for most scientific purposes. I amaware that, in Germany, the polygastric sacs, or stomachs, inthe smallest genus of animalcules, the Monads, are… … SOLAR AND GAS MICROSCOPES. 185 solar that has ever been produced in this country had a set ofachromatic lenses, whose foci ranged from an inch and a halfto two-tenths of an inch; but, in some that I have made withachromatics of two inches focus, even their superiority overcommon lenses was…
Microscopy
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