1878.] 



during Transit of Venus Expedition. 



7 



standard clocks of fixed observatories, and at other times with, the 

 chronometers kept on board H.M.S. " Volage." No direct observations 

 were taken with the transit theodolite to check the error and rate of 

 the chronometer, but these depend entirely on the comparisons. It 

 will not be necessary to give in fall the details of each comparison, 

 bat all the requisite information is contained in the following table. 



Table VI. 



yj\jdb\tiAjlX» 



1875. • 



Chronometer 

 time. 



Fast on 



a. m. t. 



Daily rate. 







h. m. s. 



h. m. s. 



s. 



Bombay Observatory 



April 8 



4 52 33 p.m. 



6 58 7-23 







» io 



4 46 40-8 



6 58 14-23 



+ 3*50 





„ 12 



10 37 



6 58 22-43 



+ 3-64 



Aden, H.M.S. Volage 



» 27 



3 



6 59 16-90 



+ 3-56 





9 



6 59 17-88 



+ 3-92 



Port Said 



May 15 



5 10 



7 33-20 



+ 4-31 





„ 24 



5 38 



7 1 11-00 



+ 4-20 



Palermo Observatory 



„ 29 



ISToon. 



50 17-74 







June 3 



4 



50 29-53 



+ 2-30 





„ 8 



4 



50 56-91 



+ 5*48 





„ 19 



2 



51 18-26 



+ 1-94 





„ 20 



7 6 



50 0-67 







„ 21 



9 46 



49 59 -27 



- 1-24 



When the journey through Sicily was commenced, the chronometer 

 was altered to approximate local times. The great change in the 

 daily rate between Naples and Rome will not affect the results at 

 Rome, as the declination was measured from the standard mark at 

 the Roman College Observatory. Before reaching Moncalieri the 

 chronometer appears to have met with an accident which entirely 

 altered its rate, but the double comparison at this station renders 

 this change of less moment. 



