whole vol. notes. north atlantic 45 



Pressure. 



All values have been reduced to normal gravity (Lat. 45°) l>y 

 applying a correction of +1.0 mm. 

 Temperature. 



Instruments: A standard thermometer screen of the Madrid type 

 was in use throughout. 

 Precipitation. 



Instrument: A Hellmann rain gage was in use throughout the 

 period. 



FAROES 



THORSHAVN 

 Authority. 



Det Danske Meteorologiske Institut, Copenhagen, Denmark. 

 Observations ceased at the end of March 1925. 

 Pressure. 



Site: The height of the barometer above Mean Sea Level was 



25.7 m throughout the period. All values have been reduced 



to Mean Sea Level by applying a correction of +2.4 mm. 



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



45 ) by applying a correction of +1.1 mm. 



Temperature. 



Hours: The values are from observations at 8 h , 14 11 , and 2i h , 

 calculated from the following formula, which gives an ap- 

 proximation to the mean of 24 hours : 



i[8 h +i4 h + 2(2i h )]. 



GREENLAND 

 ANGMAGSALIK 

 Authority. 



Det Danske Meteorologiske Institut, Copenhagen. Denmark. 

 Pressure. 



Site: All values haye been reduced to Mean Sea Level by apply- 

 ing a correction of +3.0 mm. 

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

 45 ) by applying a correction of +1.3 mm. 

 Temperature. 



Hoars: The values are from observations at 8 h , I4 h , and 2i\ 

 calculated according to the following formula, which gives 

 an approximation to the mean of 24 hours : 



H2(8 h +i4 h )+5(2i h )]. 



