SMITHSONIAN MISCELLANEOUS COLLECTIONS 



VOL. 79 



1 91 2 July to 1 92 1. Fuess Portable 1723. Index 



error correction applied +0.62 mm. 



1922 January to December. Fuess Portable 1648. 



Index error correction applied +0.15 mm. 



Hours: The hours of observation are as follows : 



1869 to 1899. From readings every three hours. 



1900 to 1903. From hourly readings of a barograph. 



1905 to 1922. The means of observations at 8^, 14'^ 

 and 20'", corrected to reduce them to true means 

 of 24 hours by a correction of +0.04 mm. 

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



45°). 

 The values for 1900 are stated to be unreliable. 



Temperature, 



Exposure: The thermometers had at least two different ex- 

 posures prior to 1900, when a screen of the present 

 Egyptian pattern was installed, being first placed 

 on a north verandah and later in a Renou pattern 

 screen inside a louvred shed. The thermometers 

 were moved from the verandah to the garden in 

 1890, and it seems probable that another change of 

 exposure took place about the beginning of 1897, 

 and that the mean temperatures for 1897, 1898, 

 and 1899 are too low. Even since 1900 the exposure 

 cannot be considered to have been quite uniform, 

 as latterly the screen became rather sheltered by 

 trees. 



Hours: 



1869 to 1899. From readings every three hours. 

 1900 to 1903. From hourly readings. 



1904 to 1922. The values are from the dry bulb observa- 

 tions at 8^\ 14'^ and 20^^, and the minimum ther- 

 mometer readings, calculated according to the 

 following formula: 



|(8i^+i4*^ + 2o'^-l-Min.) 



and reduced to the true means of 24 hours by 

 a])plving the following corrections: 



Precipitation. 



The height of the rim of the rain gage above the ground was 

 i.o m. 



