328 



TRANSIT OF VENUS, 1874. EGYPT. 



ERRORS and RATES of the SOLAR CHRONOMETER HEWITT 890 on MOKATTAM MEAN 

 SOLAR TIME from the exchange of Signals between MOKATTAM and ALEXANDRIA. 



(Extracted from the Section Longitude of Mokattam, page 278.) 



DIFFERENCE of LONGITUDE between MOKATTAM and ALEXANDRIA 

 (HOTEL DE L' EUROPE). 



Combining the values in the preceding Table with the weights assigned, 

 we have for the Apparent Longitude of Alexandria (Hotel de 1'Europe) "West 

 of Mokattam Station 



5 m . 32'-6o. 



This depends upon Captain Browne's and Mr. Hunter's methods of obser- 

 ving transits of stars, and requires correction also for personal equation in the 

 method of giving and receiving signals. 



* On November i5 the transits at Alexandria are unsatisfactory (the instrument was not reversed). 

 On November 16 there was no exchange of signals with Mokattam, but good transits were obtained 

 at Alexandria. The results for November i5 and 16 have each been allowed one-half weight only. 



