WHOLE VOL. NOTES. SOUTH AMERICA IO9 



1904 to 1923. A U. S. Standard rain ,qa,u:e was in use. The 

 rims of the rain yages were about i m. above the 

 roof of the tower. 

 Hours: Previous to 1915, the rainfall referred to the civil day. 

 From 1915 onwards, the rainfall was for the 24 

 hours beginning at 6'\ 



SOUTH AMERICA 

 ARGENTINA 



AUTIIORITV. 



The data from the Argentine Stations were pre])ared by the 

 Climatological Section of the Argentine weather service 

 ( ( )ficina Metcorologica Xacional, Argentina). 

 Sites. 



The early observers of the Argentine weather service were volun- 

 tary observers, and the exposures of the instruments were 

 not standardized. Beginning with 1885 more systematic 

 methods were introduced and moderate salaries paid to the 

 observers. The instruments and exposures were standard- 

 ized and inspected by travelling inspectors from the central 

 office. 



The thermometers are exposed in a standard louvred screen ap- 

 proximating in size to that used by the United States 

 Weather Bureau. At most of the stations it is within 6 or 

 8 ft. of the earth's surface. 



The standard rain gage is about 8 cm. in diameter and is attached 

 to a post extending i to 2 m. al)ove the ground. 

 Hours of Observation. 



Lentil the end of 1903 observations were made at 7'', 14''. and 

 21''. Beginning with January 1, 1904. they were made at 

 8'\ I4'\ and 2o'\ The mean ])ressures given in the tables 

 are the means of these hours corrected to the means of 

 24 hours. The mean temperatures are the means of the 

 daily maxima and minima, ^( daily Max.-|-daily Min.) cor- 

 rected to the mean of 24 hours by means of corrections de- 

 rived from thermograph records. The rainfall at most of 

 the stations was observed at 7'' or 8'\ 



BAHIA BLANCA 

 Hours of Observation. 



Some of the earlier years were from observations made at vari- 

 ous coml)inations of hours, but all are corrected to mean of 

 24 hours. 



