94 



THE TRANSATLANTIC LONGITUDE. 



Exper't and signal 



No. of 



Earth- 



5» interval. | 



10= interval. | 



Al 



. 



station. 



cells. 



coimection. 



Pos. 



Neg. 



Pos. 



Neg. 



5» 



10» 



L 1. 



Val. 



4 



Middle 



20^874 



20».894 



20^840 



20^815 



20^886 



20^830 



I. 2. 



" 



4 



Ziuc 



20.698 



20.876 



20.680 



20.840 



20.800 



20.744 



I. 3. 



" 



4 



None 



20.790 



20.792 



20.677 



20,780 



20.791 



20,718 



IL 1. 



Val. 



4 



Middle 



20.893 



20.869 



20.876 



20,845 



20.879 



20.863 





Newf. 



20 



None 



20.898 



21.921 



21,903 



21.890 



21.911 



21.898 



II. 2. 



Val. 



4 



Zinc 



20.692 



20.870 



20.690 



20.780 



20.792 



20.735 





Newf. 



20 



None 



21.918 



21.940 



21.937 



21.935 



21.931 



21.936 



II. 3. 



Val. 



4 



" 



20.758 



20.827 



20.760 



20,800 



20.798 



20.780 





Newf. 



20 



" 



21.897 



21.909 



21.960 



21.955 



21.904 



21.958 



III. 1. 



Newf. 



4 



Middle 



22.232 



22.262 



22.260 



.... 



22.251 



.... 



in. 2. 



" 



4 



Zinc 



22.307 



22.301 



22.247 



22.345 



22.304 



22.306 



III. 3. 



" 



4 



None 



22.290 



22.270 



22.263 



22.300 



22.279 



22.278 



IV. 1. 



Val. 



4 



Middle 



21.192 



.21.150 



21.157 



21.215 



21.166 



21.180 





Newf. 



4 



" 



. 



22.316 



. 



22.285 



22.316 



22.285 



IV. 2. 



Val. 

 Newf. 



4 

 4 



Zinc 







21.195 

 22.315 



.... 



21.180 

 22.300 



:::: 



.... 



IV. 3. 



Val. 



4 



None 



21.188 



21.164 



21,133 



21.150 



21 174 



21.140 





Newf. 



4 





22.270 



22.259 



22.317 



22.295 



22.271 



22.308 



whence we find the sum of the transmission-times, in the two directions in the 

 experiments when batteries are used at each station, to have been 









Excess for 10' interval. 



Exper't. 



5' 



10' 



Val. 



Newf. 



Sum. 



II. 1 



0=.426 



0^429 



+ 0'.016 



— 0'.013 



+ 0^003 



II. 2 



.533 



.595 



+ 0,057 



+ 0.005 



+ 0.062 



II. 3 



.500 



.572 



+ 0.018 



+ 0.054 



+ 0.072 



IV. 1 



.544 



.499 



—0.014 



—0.031 



—0.045 



IV. 2 



.544 



.514 



+ 0.015 



—0.015 



0.000 



IV. 3 



1 0.491 



0.562 



+ 0.034 



+ 0.037 



+ 0.071 



The mistakes, heretofore mentioned, at Heart's Content in the number of cells 

 and in the connections on the 10th November, put it out of our power to make any 

 definite inferences from the first two experiments of Series II ; and the number of 

 signals after intervals of 10', in the first two experiments of Series IV, was so small 

 as to forbid much reliance upon their mean. But the evidence here also indicates 

 that a longer time was consumed in the transmission of signals after the longer 

 interval. 



Finally, the first and third series of experiments (in which a battery was employed 

 at one station only) give the following results for the relative speed of the make- 

 circuit and break-circuit signals, four cells beiug used in every instance. 



