Excerpt from Sanitary, Heating, and Ventilation Engineering: A General Reference Work on Hydraulics, Municipal Water Supply, Domestic Hot Water Supply, House Drainage and Venting, Sanitation Methods, Sewage Disposal Systems, Heating and Ventilation, and Management of Sanitary Engineering Business; Four Volumes Q There are over twenty million buildings in the United States - millions of them with antiquated plumbing, and millions of others that have no plumbing whatever. Again, there are six-and-one-half millions of a type that should be radiator heated. Of the number already heated, ninety per cent are prospects for improvements in the efficiency of their heating plants. 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.