Excerpt from Hydraulic Tables: The Elements of Gagings and the Friction of Water Flowing in Pipes Aqueducts, Sewer, EtcIN preparing the Second Edition for the press such errors as have appeared in the original text and tables have been corrected, and while it is not to be hoped that all have yet been eliminated the continuous use of the book for over three years has failed to develop others. Beyond an explanation of the derivation of the last term in the Hazen and Williams formula, the changes are con fined to that part of the book devoted to the ¿ow Of water over weirs, where some new matter relating to submerged weirs is pre sented in the text, and where the table Of discharge by Bazin's formula has en extended to cover variations Of head by Of a foot from [mo to 6 feet, making in all a table Of thirty pages instead of the two pages in the former edition. A table Of discharge of high weirs 10, 20, and 30 feet, under heads from 6 to 20 feet has been added and a new title page has been written, giving a more correct description Of the scope Of the book, and the table Of con tents has been extended. These additions have all been made in response to requests or suggestions from users of the former edition, and it is believed they will appreciably increase the usefulness of the volume.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.