Excerpt from The Purification of Public Water Supplies The principal object in bringing out this work at the present time is to impress upon city officials, hea
Excerpt from The Purification of Public Water Supplies: A Comparison in Methods, Cost and Results The fact that the percentage of removal of this abnormally pol
This work has been selected by scholars as being culturally important, and is part of the knowledge base of civilization as we know it. This work was reproduced
Excerpt from The Filtration of Public Water-Supplies There are three principal methods of securing a good water supply for a large city. The first consists of d