THE TRANSATLANTIC LONGITUDE. 



69 









1866, November 9. 











Series I. 



Series II. 



Series III. 



1 ^'' 



3" 

 



QM OS 



T 40 



3" l-" 6» 

 8 45 



3''10»12' 

 IT 52 



8''ll-"n' 

 18 56. 



3n6"'23' 

 24 3 



3H7"28' 

 25 8 



rt pos. 

 1 neg. 

 •3 all: 



2 52 



20.25 



20.27 



20.26 



-24.341 



2 52 20.2T 

 20.30 

 20.28 

 —24.342 



2 52 20.30 

 20.28 

 20.29 

 —24.354 



2 52 20.26 

 20.26 

 20.26 

 —24.355 



2 52 20.27 

 20.29 

 20.28 

 —24.363 



2 52 20.29 

 20.26 

 20.28 

 —24.364 





3 

 



3 6 

 10 44 



3 4 11 

 11 49 



8 13 13 

 20 51 



8 14 18 

 21 56 



3 19 44 



27 25 



3 20 50 



28 28 







S pos. 

 1 neg. 

 f all. 



2 52 



2L32 



21.34- 



21.33 



-24.345 



2 52 21.34 

 21.33 

 21.33 

 —24.346 



2 52 21.34 

 21.36 

 21.35 



—24.358 



2 52 21.39 

 21. 3t 

 21.38 

 —24.360 



2 52 21.35 

 21.37 

 21.36 

 —24.367 



2 52 21.41 

 21.36 

 21.39 

 —24.369 



■i Corr. 





-48.686 



—48.688 



—48.712 



—48.715 



—48.730 



—48.733 



1 pos. 

 i neg. 

 a all. 



j3 



5 44 



41.57 

 41.61 

 41.59 



5 44 41.61 

 41.63 

 41.62 



5 44 41.64 

 41.64 

 41.64 



5 44 41 65 

 41 63 

 41.64 



5 44 41.62 

 41.66 

 41.64 



5 44 41.70 

 41.62 

 41.66 



pos. 

 a; neg. 

 all. 





0.53 

 0.58 

 0.53 



0.53 

 0.51 

 0.52 



0.52 

 0.54 

 0.53 



0.57 

 0.55 

 0.56 



0.54 

 0.54 

 0.54 



0.56 

 0.55 

 0.56 



?. 





2" 51" 56". 45 9. 



2" 51"' 56^463. 



2" 51"' 56'.459. 



It is manifest that A^ — At' was in no instance variable during the telegraphic 

 exchanges, so that no correction is needed for the deduced values of x on account 

 of difference of clock-rates ; and there is every reason to believe, both from theo- 

 retical considerations and from special experiment, that the velocity is the same for 

 eastward and for westward signals, and that the resultant ?. is consequently subject 

 to no correction depending upon the clocks. 



The resultant values of the longitude are thus found to be 



1866, October 25, 2'' 51-" 56'.477 



28, 56.487 



November 5, 56.455 



6, 56.481 



9, 56.460 



subject, however, in every case to a correction for personal equation in determining 

 the time. 



The mean interval between the moments of giving the signals and of their record 

 upon the chronograph sheet is similarly found to have been 



October 25, 0'.62 ± O'.OOS 



28; 



November 5 

 6 

 9 



0.64 

 0.59 

 0.55 

 0.54 



.010 

 .004 

 .007 

 .005 



in which the quantities appended are the probable errors of the respective deter- 



