288 TRANSIT OF VENUS, 1874. EGYPT. 



" clock slow " greater than that of the Greenwich standard observer (using 

 the Greenwich Transit Circle and Chronograph), as follows : 



1874, August 1 5, B C = + o - ig5 



21, o'iS 



There appears to be no reason for rejecting the discordant result of July 6. 

 The observations on that night with both instruments were as numerous and 

 apparently as good as those on any other night. 



We are now in a position to form the Concluded Longitude of 

 Mokattam : 



h m s 



Apparent Longitude of Mokattam East of Greenwich, as 



deduced from Table XI ........................ 2. 5. 6-58 



Correction for personal equation between the Observers 



In giving signals, o s o 1 6 "1 



In receiving signals, o s 'o76 / 

 Correction for personal equation between C and B in 



the manner of obtaining star transits .............. o'25 



CONCLUDED LONGITUDE OF MOKATTAM, EAST OF 



GREENWICH .................................. 2. 5. 6-24 



W. E. 

 C. 0. B. 



