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Excerpt from Prisms: Their Use and Equivalents The preparation of this book on "Prisms, their use and equivalents," has been prompted by the request of many students and correspondents, though it is written primarily for those who may desire a more extended knowledge on this branch of refraction than is contained in works on Ophthalmology. In fact, this volume is in part a compilation of the writers lectures on prisms delivered during the winter course at the Philadelphia Polyclinic. The author's double prism, a new and delicate test, for the detection of errors of muscular imbalance whether of small or great amount, is incorporated in the text. To make the subject-matter more entertaining, the writer has not limited himself to the consideration of prisms in ophthalmic practice alone, and by omitting mathematic formulas and inserting many illustrations, the text is made easy of comprehension. About the Publisher Forgotten Books publishes hundreds of thousands of rare and classic books. Find more at 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.
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