Excerpt from The High School PhysicsAlthough this book has, been prepared with a view to laboratory work, it may, in common with all text-books, be used as a mere cram book. It may be advantageously used by those teachers who prefer or are compelled, by a real or a supposed want of time, to perform experiments themselves with elaborate apparatus. Such apparatus, if the teacher possesses it, is best explained to the pupil viva voce, and pictures of the apparatus are not needed, while the book will serve an additional and an important purpose of showing how the same results may be obtained in a more simple way. The great central ideas which are kept prominent throughout the book, and which serve to connect the difierent departments of Physics in one coherent whole, are the doctrines of the conservation of energy and the correlation of forces. So far as practicable, experiments precede the statements of definitions and laws, and the latter are not given until the pupil is prepared, by previous observation and discussion, to frame them for himself. The subjects are so arranged that, in case a year is devoted to this study, Heat and Electricity-may be studied in the winter months, and Light in the sunny days of summer.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.