82 smithsonian miscellaneous collections vol. 79 



Precipitation. 



Site: The height of the rain gage ahove Mean Sea Level was : 



1902 to 1914 32 111. 



1915 to 1923 64 m. 



Instnnncnt: A recording rain gage of Fascianelii, with a receiver 

 0.2 m. in diameter, was in use throughout. 



PONTA DELGADA 

 Authority. 



Servico Meteorologico dos Aqores, Ponta Delgada, San Miguel, 

 Agores. 

 Pressure. 



Site: The height of the harometer cistern above Mean Sea Level 

 was: 



1894 to 1914 , 17 m. 



1915 to 1923 22.2 m. 



All values have been corrected to Mean Sea Level by applying the 

 following corrections : 



1894 to 1914 + 1.40 mm. 



1915 to 1923 . . . + 1.90 mm. 



Instrument: The pressure values are obtained from a barograph 

 controlled by readings of a standard barometer, 

 read 5 times a day. 

 Hours: The values are means of hourly readings from the 



barograms. 

 Notes: All values have been corrected to normal gravity (Lat. 

 45°) by applying a correction of —0.45 mm. 

 Temperature. 



Site: The height of the thermometer screen was 36 m. above 



Mean Sea Level throughout the period. 

 Hours: From 1894 to 1907 the temperature values are from 

 obsei"vations of a standard thermometer at 9'', 12'', 

 15'^ 21^^, corrected to the mean of 24 hourly read- 

 ings by the following corrections, based on hourly 

 values 1908 to 1924: 



Jan. Kill. Mar. Apr. May June July Aug. Sept. Oct. Nov. Dec. 

 °C. —0.38 —(1.41 —0.61 —0.63 —0.76 —0.84 —0.86 —0.93 —0.84 —0.69 —0.49 —0.39 



From 1908 to 1924 the values are the means of the 

 24 hourly readings from a thermograph, compared 

 with a standard thermometer 5 times a day. 

 Precipitation. 



Site: The height of the rain gage above Mean Sea Level was 

 37.5 m. throughout the period. 



