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 201
e decided upon by trial, after the magnifiers or object-glasseshave been selected.* Under any circumstances it will be evident, that whenevera single condensing lens is used, some portion of the light willof necessity be dispersed ; but if there were substituted in itsstead a portion of a… … Fig. VIII. represents a section of such a reflector, with itsapex cut off; F is its focus for parallel rays, within which theobject is to be placed. By a principle of the parabola, allthe rays of the sun impinging upon its surface will be reflectedtowards F, without aberration or dispersion; and…
Microscopy
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