Excerpt from Practical Physics: Molecular Physics Sound
This Series is intended to meet the requirement of brief text-books both for schools and for adult readers who wish to review or expand their knowledge.
The grade of the books is intermediate between the so-called "primers" and the larger works professing to present quite detailed views of the respective subjects.
Such a notion as a person beyond childhood requires of some subjects, it is difficult and perhaps impossible to convey in one such volume. Therefore, occasionally a volume is given to each of the main departments into which a subject naturally falls for instance, a volume to the Zoology of the vertebrates, and one to that of the invertebrates. While this arrangement supplies a compendious treatment for those who wish, it will also sometimes enable the reader interested in only a portion of the field covered by a science, to study the part he is interested in, without getting a book covering the whole.
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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. Это и многое другое вы найдете в книге Practical Physics (Frederick Guthrie)