ELECTRICAL METHODS 



561 



Geophysical investigations for several different types of water supply 

 problems are illustrated by descriptions of the following actual surveys. 



In connection with some experiments * at the University of Arizona, 

 water supply investigations were carried out on the Santa Rita Range 



Fig. 345. — Bedrock contours on placer property in Trinity County, California. (A.I.M.E. 

 Geophysical Prospecting, Tech. Pub. 515, 1934.) 



Reserve at the northern end of the Santa Rita Mountains, southeast of 

 Tucson, Arizona. The investigations were conducted in adjacent canyons 

 or washes ; namely, Saw Mill canyon, in which a small supply of water 

 was already developed through a well to the bedrock, and in Florida 



* Arranged by Dr. G. M. Butler, Dean of the College of Mines and Engineering, 

 University of Arizona, Tucson. 



