94 SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. 79 



Hours: The values of pressure do not refer to a fixed hour, but 

 are the mean vakies of 3 to 6 observations per day. 

 The diurnal variation is negligible in comparison with the 

 variation from month to month. 

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

 45°) by applying a correction of +1.2 mm. 

 Temperature. 



Hours: The hours of oliservation are as follows : 



(1) 8'\ 



(2) i4'V 



(3) -U8"+i4"). 



Site: As for I'ressure. In order to make the observations at 

 the two sites comparable, a correction of +0.7° C. 

 has been applied to the values for 1921, September 

 to 1923, J3ecember. 

 Precipitation. 



The height of the rim of the rain gage above the ground is i.i m. 



MADEIRA (FUNCHAL) 

 Authority. 



Observatorio Central Aletecjrologico, " Infante D. Luis," Lisbon, 

 Portugal. 

 Pressure. 



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



25 m. throughout the period (1880 to 1920). 

 Instrument: A Kew pattern barometer was in use throughout 



the period. 

 Hours: The values are the means of observations taken at 9'\ 



i5'\ and 2i'\ 

 Notes: All values have I)een corrected to normal gravity (Lat. 

 45°) by applying a correction of —0.85 mm. 

 Temperature. 

 Means: 



The standard adopted is an approximation to the mean of 24 

 hourly readings given by the mean of the dry bull) readings 

 at 9'' and 21'' and of the daily maxima and minima 

 given by self -registering thermometers, i. e. 



1(9^ 4- 2 1'' + max. + min. ) . 

 Precipitation. 



Instrument: A Babinet pluvicjmeter (of diameter 1 1.27 cm.) was 

 in use throughout the period. 



