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Introduction 1 



Equipment Used in Upper -Wind Observations 2 



Shipboard Theodolite 1 



Hydrogen 2 



Balloons 2 



Balloon -Sextant 3 



Reduction of Observations 3 



Proceedure 5 



Meteorological Conditions during Pilot-Balloon 



Flights, 1-171 5 



General Circulation of Winds over the Tropical 



Regions of the Pacific 10 



Shallowness of Southeast Trade Winds off the 



Peruvian Coast 10 



Upper Winds over South American High-Pressure 



Area 11 



Trades and Antitrades between 100° and 140° 



West in Latitudes 15° to 20° South 11 



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General Circulation of Winds over the Tropical 



Regions of the Pacific--Continued 10 



Trades and Antitrades In Central Area of South 



Pacific Ocean 11 



Winds in the Equatorial Region of the Pacific 



Ocean 11 



Pacific Ocean off Japan 12 



Trades and Antitrades East of the Latitudes of 



Hawaiian Islands 12 



Height of Clouds over the Pacific Ocean 12 



Trade Winds 13 



Variation in Velocity with Height 13 



Stratification of Trade Winds 13 



Literature Cited 13 



Tables 6-8 15 



Figures 1-45 47 



Index 93 



