Excerpt from Technical Book Review Index, Vol. 7: March 1923 This index, printed from part of a card index maintained by the Carnegie Library of Pittsburgh, is a record of certain book reviews appearing in the scientific, technical, and trade journals currently received in the Technology Department. It is concerned mainly with books on pure and applied science, but includes a few on allied subjects. Its purpose is primarily to index reviews rather than to compete with any existing booklist by suggesting books on any subject, or by furnishing bibliographic information. In accordance with this plan, the arrangement is by authors, though the form of entry, being determined from the review and not from the book itself, is in some cases doubtless incorrect. Except for the correction of obvious errors, the bibliographic information is as given in the review, or as combined from two or more reviews when several are indexed. Since many of the reviews are carelessly done, the information given is, in many cases, both inaccurate and incomplete. In general the names of publishers are abbreviated in accordance with the practice in the more important book-trade bibliographies. Titles of journals are as a rule given in full. Each quotation immediately follows the name of the journal from which it is taken. Obviously these brief extracts, thus detached from the context, must not be accepted as conclusive. Very often a review is so equivocal that there can be no unanimity of opinion as to whether it is favorable or unfavorable. For this reason no estimate is given here. Except for this one omission, this index is an exact copy of cards filed in the book review index of the Carnegie Library of Pittsburgh. The first volume (1917) of the Technical Book Review Index appeared in six numbers. The first three of these were included in the Monthly Bulletin - appearing in the numbers for March, April, and May respectively - and quarterly numbers were published in July, October, and December. The issue of December 1919 contains a list of the publishers referred to in the first three volumes, and the December 1920 issue contains a supplement to that list. These lists have also been printed separately. The price of the Index is fifty cents a year. 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.