WHOLE VOL. NOTES. AFRICA 5 



ininimuni theniiometer readings, calculated accord- 

 ing to the following formula : 



i(8i^+i4'^ + 2o'^ + Min.) 



and reduced to true means by a correction derived 

 from five years' thermograph charts. 



Notes: There does not seem any reason to fear any serious dis- 

 continuity except possibly at about 1901, v\dien a 

 screen of the Egyptian pattern was installed. No 

 record of the form of screen employed at Kom el 

 Nadura before that date can be traced, nor is the 

 date when the screen was changed known for cer- 

 tain. It was, however, between 1901 and 1905. 

 Precipitation. 



The height of the rim of the rain gage above the ground is 2.0 m. 

 The observations of Kom el Nadura only have 

 been included. 



ALIWAL (NORTH), SOUTH AFRICA 

 Authority. 



Meteorological Office, Department of Irrigation, Pretoria, Union 

 of South Africa. 

 Pressure. 



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



was 4352 ft. throughout the period (1892 to 1918). 

 Hours: The hour of observation was 61^ Greenwich Mean 



Time throughout the period. 

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

 45°) by api)lying a correction of —.039 in. 

 Temperature. 



Site: As for Pressure. 



Mean: The standard adopted is the mean between the mean 

 daily maxinnim and the mean daily minimum. 

 Precipitation. 



Site: As for Pressure. 



BATHURST, GAMBIA 



Lat. 13° 24' N. Long. 16° 36' W. 

 Precipitation. 

 Authorities: 



1884-1903. MS. data supplied by the Governor, Bathurst 

 and filed in the Meteorological Office, London. 



