CONTENTS 



I. THE SIGNIFICANCE OF ATMOSPHERIC-ELECTRIC OBSERVATIONS AT SEA 



n. INSTRUMENTS, OBSERVATIONAL PROCEDURE, AND CONSTANTS 



FIGURES 1 - 25 



m. REPORT ON ATMOSPHERIC-ELECTRIC WORK, CARNEGIE CRUISE Vn, 

 1928-1929 



COMMENTS 



IV. ABSTRACT OF LOG 

 V. DAILY ATMOSPHERIC-ELECTRIC RESULTS 



VI. ATMOSPHERIC-ELECTRIC DIURNAL -VARIATION RESULTS 



Vn. ATMOSPHERIC POTENTIAL-GRADIENT RESULTS 



Vni. ATMOSPHERIC CONDUCTIVITY RESULTS 



IX. STUDIES IN ATMOSPHERIC ELECTRICITY 



DETERMINATION OF REDUCTION FACTORS FOR THE CONVERSION OF 

 MEASURED VOLTS TO POTENTIAL-GRADIENT IN VOLTS PER 

 METER FOR CRUISE VII, CARNEGIE, 1928-1929 



THE DIURNAL VARIATION OF THE ELECTRIC POTENTIAL OF THE 

 ATMOSPHERE OVER THE OCEAN 



THE ELECTRICAL CONDUCTIVITY AT SEA 



THE RATIO OF POSITIVE TO NEGATIVE CONDUCTIVITY ON CRUISE 

 vn AND ITS VARIATION WITH POTENTIAL-GRADIENT 



THE COMPUTED MOBILITY OF SMALL IONS IN THE ATMOSPHERE 

 OVER THE OCEANS 



INTERESTING ASPECTS OF THE AIR-EARTH CURRENT DENSITY OVER 

 THE OCEANS AS DERIVED FROM ATMOSPHERIC -ELECTRIC DATA 

 OF CRUISE vn OF THE CARNEGIE 



THE NUMBER OF CONDENSATION NUCLEI OVER THE ATLANTIC AND 

 PACIFIC OCEANS 



NOTE ON PENETRATING RADIATION MEASUREMENTS OF THE 

 CARNEGIE'S SEVENTH CRUISE 



FIGURES 1-17 



INDEX 



Vll 



