Excerpt from First Principles of Natural Philosophy: A d104-Book for Common Schools The latest developments of science, such as the intro duction and use of electrical units, have been freely utilized the mere polemics of physics has been ignored. Any teacher or pupil using this book and finding any error therein is requested to communicate the same to the publishers or author. 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.