60 THE TRANSATLANTIC LONGITUDE. 



minations as deduced from the total results of the several sets, there being six sets 

 for each determination except that of November 6. 



On the 25th October the cable of 1865 was employed, one-half the circuit being 

 formed by the earth ; a battery of ten ceils was used at each station, and " con- 

 densers" were interpolated between the battery and the cable. On the 28th Octo- 

 ber the connections were the same, in every respect, as on the 25th ; but on the 

 three other days the two cables were joined so as to form a complete metallic circuit, 

 the number of elements employed being — 



November 5, 3 at Valencia, 3 at Newfoundland. 

 6, 3 " 10 



9, 4 " 10 " 



VIII. 



LONGITUDE SIGNALS BETWEEN HEART'S CONTENT AND CALAIS. 



Clock-signals were exchanged between these two stations on four nights, upon 

 only two of which the clock-errors at Calais could be determined either immediately 

 before, or soon after, the exchange, one of these two nights being the same on which 

 the clock occasioned so much trouble. It is a source of regret also that the signals 

 were not exchanged according to the rule laid down in the programme, which pre- 

 scribed that the Calais clock should be put into the circuit several times, for not 

 more than half a minute at each time, while the time-scale was graduated for both 

 chronographs by the Heart's Content clock only. In this way it would not have 

 been difficult to obtain both records on the sheets at both stations with the ordinary 

 connections, and without the necessity of continual adjustments of the relay mag- 

 nets, and the results would have been more satisfactory in other respects. 



On the 11th and 12th December, only the first and last signals of the Heart's 

 Content clock in each minute can be deciphered, but these are legible by reason of 

 the omission of the second-marks corresponding to the beginning of the minute. 

 For the other two nights this difficulty does not exist. The means of the records 

 are appended for the two stations separately. Upon the first two dates the individual 

 measures from the Calais registers, although numbering but two in each minute, 

 were derived from consecutive minutes. 



Newfoundland Signals. 



Date. 



No. 



H. 



C. clock-time. 



Calais clock-time. 



1866, December 11. 



10 



6" 



46"" 



O'.O 



5" 53" 



13».912 





10 



1 



8 



0.0 



6 15 



13.908 



December 12. 



10 



6 



21 



0.0 



5 28 



14.828 





16 



Y 



29 



30.0 



6 36 



44.813 





12 



T 



5^ 



30.0 



T 4 



44.838 



December 14. 



38 



5 



43 



40,0 



4 50 



56.462 





40 





44 



20.0 



51 



36.461 





39 





45 



0.0 



52 



16.453 





39 





45 



40.0 



52 



56.451 





40 



5 



46 



20.0 



4 53 



36.455 



