Elements of Natural Philosophy

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Excerpt from Elements of Natural Philosophy: II Acoustics, III Optics Those who are familiar with the subjects of which the present volume professes to treat, will readily the sources whence most of its materials are drawn. In the use of these materials, no distinction of principle is made between sound and light. Both are regarded and treated as the effects of certain disturbances of that particular state of mole onlar equilibrium which determines the ordinary condition of natural bodies the only difference being in the media through which these disturbances are propagated, and in the organs of sense by which their effects are conveyed to the mind. 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.