4 SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. 79 



ALEXANDRIA (KOM EL NADURA) EGYPT 



Authority. 



Physical Department, Ministry of Public Works, Cairo, Egypt. 

 Pressure. 



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



2,2 m. throughout the period. 

 Instruments: The following l)arometers were in use: 

 1888 to 1900 April. The barometer and index 

 error correction in use during these 

 years are unknown. 



1900 May to 1909 May. Fuess Portable 1439, 



index error correction applied —0.20 mm. 



1909 June to 191 5 July. Fuess Portable 1439. 



index error correction applied —0.13 mm. 



191 5 August to 1918 x^pril. Fuess Portable 



1439, iii<Jex error correction ap[)lied. . +0.06 mm. 

 1918 May to 1922. Fuess Portable 1439, i"t^ex 



error correction applied —0.10 mm. 



Hours: The hours of observation are as follows: 



1888 to 1900. From readings every three hours. 



1901 to 1922. The means of observations at 8'\ i4'\ and 



20^, corrected to reduce them to true means. 



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

 45°) by applying a correction of —0.97 mm. 

 Temperature. 



Hours: 1870 to 1888. From observations made by Pirona at 

 9'^ and 2i^\ 

 The means represented by the formula 1(9^ + 21'' 4- Max. 

 + Min.) are corrected to reduce them to Kom el 

 Nadura true means, by corrections derived from 

 comparison of the observations made at the two 

 stations during the eight years 1889 to 1896. 



1889 to 1896. The values given are the means between 



Pirona's corrected results (see 1870 to 1888) and 

 those of Kom el Nadura. 



The two series are in good agreement, the average differ- 

 ence between monthly means without regard to 

 sign being only 0.12° C. 



1897 to 1900. The values given are means of observations 

 taken every three hours at Kom el Nadura. 



1901 to 1922. The values given are the means of the dry 

 bulb observations at 8^, I4'\ and 20^, and the 



