IX. STUDIES IN ATMOSPHERIC ELECTRICITY 



CONTENTS Page 



Determination of Reduction Factors for the Conversion of Measured Volts to Potential-Gradient 



in Volts Per Meter for Cruise VII, Carnegie . 1928-1929 129 



The Diurnal Variation of the Electric Potential of the Atmosphere Over the Ocean 135 



The Electrical Conductivity at Sea 137 



The Ratio of Positive to Negative Conductivity on Cruise VH and its Variation with Potential- 

 Gradient 141 



The Computed Mobility of Small Ions in the Atmosphere Over the Oceans 143 



Interesting Aspects of the Air-Earth Current Density Over the Oceans as Derived from 



Atmospheric -Electric Data of Cruise VII of the Carnegie 145 



The Number of Condensation Nuclei Over the Atlantic and Pacific Oceans 153 



Note on Penetrating Radiation Measurements of the Carnegie's Seventh Cruise 157 



Figures 1-17 161 



127 



