Download or read book Transactions of the Liverpool Engineering Society, 1921, Vol. 42 written by T. R. Wilton and published by Forgotten Books. This book was released on 2017-07-12 with total page 380 pages. Available in PDF, EPUB and Kindle. Book excerpt: Excerpt from Transactions of the Liverpool Engineering Society, 1921, Vol. 42: Forty-Seventh Session Various detailed improvements in the design of slow sand filters have been made, and I believe there is still something to be learnt of the effect of aeration upon the water before passing through the bed, but the principle remains the same to - day as when James Simpson laid down his first filter nearly 100 years ago. 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.