

W. B. No. 1278 



U. S. DEPARTMENT OF COMMERCE 



WEATHER BUREAU 



INSTRUCTIONS FOR MAKING 

 PILOT BALLOON 

 OBSERVATIONS 



Circular 0, Aerological Division 



UNITED STATES 



GOVERNMENT PRINTING OFFICE 



WASHINGTON : 1942 



For sale by the Superintendent of Documents, Washington, D. C. ------- Price 15 cents 



