Smithsonian Report, 1928. — Millikan and Cameron 



Plate 1 



1. Lake Miguilla, Bolivia. Altitude, 15,000 Feet 4,500 Meters>. About 

 2,000 Feet Long, 700 Feet Wide, and 175 Feet Deep 



2. The Type of Electroscope Sunk to Depths of 200 Feet Before Its 

 Readings Became Constant at 2.4 Ions c.c. sec. Readings at Sur- 

 face, 33.6 Ions c.c. sec. 



