Identifier: sanfrancwat4192581930spri (find matches)
Title: San Francisco water
Year: 1922 (1920s)
Authors: Spring Valley Water Company (San Francisco, Calif.)
Subjects: Water-supply
Publisher: San Francisco, Calif. : Spring Valley Water Co.
Contributing Library: San Francisco Public Library
Digitizing Sponsor: California State Library Califa/LSTA Grant

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miles, and the air is choked with smoke.Puny man in a struggle with natures mostterrifying element—an element that is kindlywhen used carefully, but a demon when un-leashed ! Communication men have set up field tele-phones wherever needed, connected with thesupreme command, in order that the fighton all sectors may be correlated and progressor losses reported. Messengers carry writteninstructions to outlying posts in order thatmen in command, removed from the tele-phone, may do their work effectively and in-telligently. Perhaps an airplane drones over-head carrying an observer who will reportwhere the enemy is most vulnerable. It is as much a battle as any warfare withguns. In such heroic struggle can man hope towin ? By experience it is known that he can.By everlastingly fighting back, by takingadvantage of natural barriers, improvedweather conditions, and the employment ofthe fighting technique developed through theyears, the enemy can be narrowed down, cut (Continued on page 14)
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While one group April, 1925 SAN FRANCISCO WATER 13 San Francisco Water PUBLISHED BY Spring Valley Water Company San Francisco, California 425 Mason Street * Phone Prospect 7000 Edward F. ODay, Editor Vol. IV April, 1925 No. 2 ONE of the significant addresses of theconference of U. S. Forest Rangers heldrecently in San Francisco was made byMajor Edward H. Bowie, District Forecas-ter, U. S. Weather Bureau, who spoke onHumidity in Relation to Fire Hazard. The relation of humidity to fire hazard,Major Bowie pointed out, is exceedinglyclose. Humidity is the amount of water-vapor in the air. When expressed in the num-ber of grains of moisture per cubic foot ofair, it is called absolute humidity. Whenexpressed in the form of a percentage, asthe ratio of the actual quantity of moisturein the air to the quantity that would saturateit under its actual conditions as to pressureand temperature, it is called relativehumidity. The Weather Bureau records relativehumidity at 5 a.m. and 5 p.m. every d

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