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 194
pencils may be corrected bya proper form and combination in the achromatic object-glass;for although it is a manifest and visible error, it would not beadvisable, in practice, to construct a form exclusively to remedyit, unless, indeed, when very low powers only are to be em-ployed ; in which case… … IV. The last defect I have to notice, will also be better un-derstood by a direct reference to Fig. V., where A is the lens, 182 THE MICROGRAPHIA. B the object, and C its image. As the several portions of theobject B are at unequal distances from the centre of the lens A,the image C, instead of…
Microscopy
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