252 



REPORT — 1898. 



seismic action. The hours at which unfelt earthquakes the origins of 

 which have been at great distances from the stations where they were 

 recorded are given with some accuracy, but the times at which cable 

 interruptions have been notified arc some time after the interruptions 

 actually occurred. Only those who are in a position to correct these latter 

 dates, and know the circumstances attending the various failures, can 

 determine which of them are likely to have originated from seismic 

 disturbances. 



In order to extend our knowledge of sub-oceanic changes, and throwing 

 more certain light upon operations leading to cable interruption, I shall 

 regard it as a great favour if officers of cable companies who may read this 

 report will send me an exact statement of the times at which failures took 

 place, which we know to have happened at ahotit the same time as unfelt 

 earthquakes have been recorded, addressing the same to me at the British 

 Association Rooms, Burlington House, London, W., England. 



Approximate Time of Cable Failures, and exact Greenwich Tiine of Unfelt 



Earthquakes. 



