278 



TRANSIT OF VENUS, 1874. EGYPT. 



The observer at the sending station made contacts every 10 seconds ; the 

 times not fractional indicate means of times of contacts, a few in each group 

 being usually omitted to make the mean identical with the time of some one 

 particular contact. The fractional times are the means of the observed 

 times of the corresponding signals at the receiving station, as noted on an 

 ordinary upright galvanometer. 



TABLE VIII. MEAN ERRORS on MOKATTAM MEAN SOLAR TIME and KATES of the 

 MEAN SOLAR CHRONOMETER HEWITT 890, at ALEXANDRIA, deduced from the 

 separate determinations of the preceding table. 



TABLE IX. DEDUCED LONGITUDE of MOKATTAM, EAST of GREENWICH, for each 

 separate group of cable signals, found by combining the DETERMINED 

 ERRORS of the MEAN SOLAR CHRONOMETER HEWITT 890 (at ALEXANDRIA) on 

 GREENWICH and MOKATTAM MEAN SOLAR TIMES. 



