The American Water Works Association is not responsible, as
a body, for the facts and opinions advanced in the Manual.
THE WILLIAMS & WILKINS COMPANY
Made in United States of America
FIRST EDITION, SEPTEMBER, 1925
REPRINTED, SEPTEMBER, 1926
COMPOSED AND PRINTED AT THE
WAVERLY PRESS
THE WILLIAMS & WILKINS COMPANY
BALTIMORE, MD., U. S. A.