Appendix B. 



At the KiiteMie Obsorvatory the meteorological observations were rogul;irly 

 carried out three times in the day, at 7, U and 21 of mean local time, which 

 ditt'ers 2 hours, 8 minutes and 45 seconds from mean Greenwich time, whereas 

 those of barometric pressure daring the journey could be made only at noon 

 of local time. 



Hence in the absence of synchronous corresponding data of Entebbe, for 



the pressure the mean of the hours 7, 14 and 21 has l)een assumed, and from 



this mean the pressure at noon may, generally speaking, be taken to differ Init 



slightly. For the temperature and the tension of aqueous vapour that of 



the nearest hour, that is 14, has been assumed. In Table II have been Ijrought 



totrether the data of the observations made at Entebbe* between 16th and 



28th May. From the data supi)lied by the two Tables I and II were calculated 



the altitudes of the various stations relatively to linteblie by means of the 



formula : t 



1 \ 



Z= 18400 (1,001.")7 + 0,00367 0) 



1 1-0,378-1 



\ ';/ 



(1 +0,00259 cos 2 X)(l + |±|^) log ^ 



where Z expresses the difference of level between the two stations. 

 H|j the presstire reduced to 0" in the lower station. 

 H the pressure reduced to 0" in the upper station. 



^ = -'^J — ^the mean l)etween the tempei'ature /,, of the aii' in the lower 



statioii and that nf / in the upper station. 



mean between the vapour tens; 

 and /' that of the upper station. 



= ' " • the mean between the vapour tension f], in the lower station 



H^+JI 

 2 

 \ the latitude, 



■; the latitude of the lower station aliove sea-level. 



The headings H,,, /„, /,, H, /, /', which figure above the columns in the 

 following tables, refer to the use of the formula for the calculation of which use 

 has been made of the " Tables Meteorologiques Internationales " (Paris, 1890). 



* According to the certiBcale of the " National Physical Laboratory," the barometer of 



till' Entebbe Observatory has a correction of — O'OUl incli. 



t 'i'liis foruuila of Kiilihnann has been adopted witliout more ado as tlie most general and 

 complete, since a discussion on the choice of aUimetric formulas, which should take account 

 of the recent results on the law of variation of the meteorological elements in the open air 

 and on the slopes of the mountains, would not hr in accord with the few available data, data 

 which, moreover, cannot always be obtained under the best condilions. 



362 



