Publisher's Synopsis
Excerpt from Microscopes and Microscopical Accessories
The word apochromatic was introduced by Prof. Abbe as a technical term for this other kind of achromatism, long familiar to scientists as a theoretical idea but only recently realised practically. With deference to intelligible technical phraseology it is desirable that this expression thus clearly defined by its author should retain its original meaning, and any attempt to utilise it for purposes of trade advertisements should be discountenanced.
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