The Optics of Metallography (Classic Reprint)

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Excerpt from The Optics of MetallographyAn objective may be said to possess seven qualities: magnifying power, aperture, or numerical aperture, resolving power, depth of focus, or penetrating power, illuminating power, ¿atness of field, and defining power. To fulfill all of these requirements in a satisfactory manner necessitates considerable skill upon the part of the optician. These quali ties will be discussed one by one.About the PublisherForgotten Books publishes hundreds of thousands of rare and classic books. Find more at www.forgottenbooks.comThis book is a reproduction of an important historical work. Forgotten Books uses state-of-the-art technology to digitally reconstruct the work, preserving the original format whilst repairing imperfections present in the aged copy. In rare cases, an imperfection in the original, such as a blemish or missing page, may be replicated in our edition. We do, however, repair the vast majority of imperfections successfully, any imperfections that remain are intentionally left to preserve the state of such historical works.