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 203
n a circle, from which thecondensed light, ere it arrive at their focal points, is receivedupon four small reflectors so situated as to throw the whole ofthe light upon the object. This plan will be readily understoodby a reference to Fig. X., where d d represent two of the four * See Fig. III. p.… … *H The following plan, contrived by myself, has manyadvantages. It consists of one condenser (the same as isused for transparent objects) and a silvered concave sphericalreflector, or cup, with an aperture through its centre to admitof the condensed light proceeding to the magnifier. This…
Microscopy
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