LA YING DEEP-SEA CABLES. 449 



If the inclination of the cable had been exactly 

 6 45' when the speed of the Great Eastern was 

 exactly 6\ miles per hour, the value of p for the 

 Atlantic cable of 1865 would be exactly 6| -7-8*478, 

 or 765 of a mile per hour. 



VOL. III. G G 



