108 smithsonian miscellaneous collections vol. 79 



Pressure. 



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



14.2 m. throughout the period (1877 to 1922). 

 Instniincuts: A Fortin barometer was in use. The following are 

 the index error corrections applied : 



1887 to 1892 September 5 +0.03 mm. 



1892 September to 1901 October 17 +0.25 mm. 



1901 October 18 to 1908 March 27 —0.25 mm. 



1908 March 28 to 1915 May 15 —0.05 mm. 



1915 May 20 to 192 1 February i —0.25 mm. 



1921 February 2 to 1922 —0.05 mm. 



Hours: The values are the means of 24 hourly observations. 

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

 45°) by applying a correction of — 1.72 mm. 



TeMI'ERATURE. 



Site and Instruments: 



1887 to 1903 Negretti & Zam])ra thermometers exi)osed in a 

 standard screen on the Observatory tower which 

 is 16 m. above the ground. The thermometers are 

 1.5 m. above the roof of the tower. 



1904 to 1909. The station was transferred to a park. 121 m. 

 ESE. of the Observatory tower. H. J. Green ther- 

 mometers exposed in a tropical shelter without a 

 screen but with a doulile roof, the lower made of 

 nipa and the upi)er made of wood. The thermome- 

 ters were 1.5 m. above the ground. 



1910 to 1922. The station was transferred to a more open 

 site in the park. 81 m. NNW. of the jirevious site. 

 Thermometers exposed in a larger tropical shelter 

 with a double roof, the lower made of wood and 

 the upper made of ni])a. The thermometers were 

 1.5 m. above the ground. 

 flours: The values are the means of 24 hourly observations. 



Pri:( Il'ITATION. 



Site and Instruments: 



1887 to 1903. N'arious types of pluviometer were in use but 

 chiefly a Symons or a Crossley type, made by 

 Negretti and Zambra. The instruments were ex- 

 posed on the Observatory tower, 16 m. above the 

 ground. 



