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Excerpt from Catalogue Nr. 35 of Microscopes and Accessory Apparatus In the construction for our lenses every device is considered which can in any way contribute to their excellence. They are made of the best Jena glass, whose index of refraction has been. Carefully computed, thus permitting the exact determination of the necessary radii of lenses, their focal distances, their greatest available apertures, e&. And similarly, it is possible to discover the point of error in any composite lens and to correct it, so that before leaving our hands all lenses of our manufacture have the same degree of excellence. About the Publisher Forgotten Books publishes hundreds of thousands of rare and classic books. Find more at www.forgottenbooks.com This 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.