WHOLE VOL. NOTES. NORTH ATLANTIC 43 



rections have been applied, since there has been no actual 

 change in " station elevation ", that is, the elevation of the 

 barometer on January i, 1900, or on the date of the establish- 

 ment of the station, to which all readings are reduced in 

 cases of removal of barometer. 



NORTH ATLANTIC 



AZORES 



HORTA 

 Authority. 



Servico Meteorologico dos Aqores, Ponta Delgada, San Miguel, 



Agores. 

 Pressure. 



Site: All values have been corrected to Mean Sea Level by 



applying a correction of +5.86 mm. 

 Instrument: The pressure values are obtained from a barograph 



controlled by readings of a standard barometer read five 



times a day. 

 Hours: The values are the means of hourly readings from the 



barograms. 

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



45°) by a PPly m g a correction of —0.45 mm. 

 Temperature. 



Site: The height of the thermometer screen above Mean Sea 



Level was 64 m. 

 Hours: The values are the means of the 24 hourly readings 



from a thermograph, compared with a standard ther- 

 mometer five times a clay. 

 Precipitation. 



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



64 m. 

 Instrument: A recording rain gage of Fascianelli with a receiver 



0.2 m in diameter was in use throughout. 



PONTA DELGADA 

 Authority. 



Servico Meteorologico dos Azores, Ponta Delgada, San Miguel. 

 Agores. 

 Pressure. 



Site: All values have been corrected to Mean Sea Level by 

 the addition of 1.90 mm. 



