for determining the difference of meridians y ^c. 103 



July 22. Rockets extremely bad ; four only could be 

 observed. 



Comparisons of Chronometer and Clock. 



Chronometer. Clock. 



Before 9* 23" I 17^ 23™ 48* 



After 



II II 



19 12 5.59 



Mean Error and Rate of Sidereal Clock. 



Mean of 5*'. 



15^ 47^ 



Mean error. 

 47-57' 



Mean rate. 

 + 0.21 



Comparisons from 21 to 22, + 0.32. 

 Chronometer fast 1™ 17.95* 



The means of the Comparisons, with the true Sidereal 

 Time corresponding. 



July II 

 12 

 »3 

 H 

 15 

 16 



17 

 18 



19 

 20 

 21 



22 



Chron. 



lo'^4m 30' 

 10 II 30 

 ID 14 30 



10 15 O 



ID 17 



10 15 



10 16 



10 24 



9 59 

 10 8 



10 II 



10 17 



o 

 o 

 o 

 o 



o 

 o 



30 



o 



Clock. 



171122™ 3.36* 

 17 32 59.87 



17 39 56.19 

 17 42 22.00 

 17 50 18.42 

 17 52 14.67 



17 57 12.70 



18 9 11.25 



17 48 



18 I 



5-43 

 3.20 



18 8 30.405 

 18 17 56.79 



True Sidereal 

 Time. 



7'»2i™ i5.o» 

 7 32 11.60 



39 

 41 

 49 

 5» 

 56 

 8 



47 

 o 



7 

 17 



7.80 



33-75 

 30.52 

 27.09 

 25.14 



23-97 

 18.27 

 15.98 



42.03 

 9.20 



