120 



Commendatore G. Marconi 



[March 13, 



with the ItaHan Cruiser, took place on behalf of the British Admiralty 

 between Poldhu and H.M.S. Duncan. 



Communication with Poldhu was maintained during the entire 

 cruise of this battleship from Portsmouth to (Gibraltar, and further 

 communication was established between Poldhu and the Admiralty 

 station situated on the Rock of Gibraltar. 



It should be noted that the distance between Cornwall and 

 Gibraltar is 1000 miles — 500 over land and 500 over water. 



The aerial at Poldhu was shortly afterwards extended by the 

 addition of wires sloping downwards, umbrella-fashion, as shown in 

 Fig. 10. This increased the capacity of the aerial, and some further 

 tests were carried out with a station at Fraserburgh, in the north of 

 Scotland. From these tests considerable advantage appeared to be 



Fig. 10. 



derived, at least for communication over land, by the adoption of 

 much longer waves than had been hitherto employed, and with a 

 wave-length of 14,000 feet it was found possible to telegraph over a 

 distance of 550 miles with an expenditure of energy of about 

 1 kilowatt. 



The operation of the long-distance stations in England and 

 America made it possible to transmit messages to ships whatever their 

 position, between Europe and North America ; and to the Cunard 

 Company belongs the credit of having greatly encouraged the long- 

 distance tests, a circumstance which enabled them to commence, in 

 June 1904, the regular publication on their principal vessels of a daily 

 newspaper, containing telegraphic messages of the latest news from 

 Europe and America. 



