1908.] 



on Transatlantic Wireless Telegraphij . 



115 



About two months later, in February 1902, further tests were 

 carried out between Poldhu and a receiving station on board the 

 American Liner Philadelphia, en route from Southampton to New 

 York. The sending apparatus at Poldhu was the same as that used 

 for the Newfoundland experiments. The receiving aerial on the ship 

 was fixed to the mainmast, the top of which was 60 metres above 

 sea-level. 



As the elevated conductor was fixed and not floating about with 

 a kite, as in the case of the Newfoundland experiments, good results 

 were obtained on a syntonic receiver, and the signals were all recorded 

 on tape by the ordinary Morse recorder. 



On the Philadelphia readable messages were received from Poldhu 

 up to a distance of 1551 miles, S's and other test letters as far as 2099 

 miles. 



The tape records of the signals are in my possession, and some of 



Fig. 7. 



them are here exhibited to-night. The distances at which they were 

 received are all verified and countersigned by the Captain and Chief 

 Officer of the ship who were present during the tests. 



Captain Mills, of the Philadelphia, was also good enough to mark 

 on a chart, which I have here to-night, the various positions of the 

 ship between England and America at which the communications 

 from Poldhu were received. 



Although I never had the slightest doubt in my mind as to the 

 genuineness of what was accomphshed between Poldhu and New- 

 foundland, the results obtained on the Philadelphia amply prove that 

 the station at Poldhu was capable at that time of transmitting signals 

 to a distance of at least 2000 miles, which is the distance separating 

 Cornwall from Newfoundland, and that if it was practicable to send 

 a message over 2000 miles of sea from shore to ship, it should also 

 be practicable to send it over the same space of ocean from shore 

 to shore, \ 2 



