414 



AUSTIN— ENERGY IN RADIOTELEGRAPHY. [April 19. 



portional to the square of the received current, the signal was re- 

 duced to approximately one three-hundredth. 



During the months of February and March of this year, the 

 cruiser Salem was sent on a voyage to Gibraltar for the purpose of 



i(r« AMP. 



700 



600 



BIRMINGHAM RECEIVED AT BRANT ROCK, JULY, 1910 



£00 



400 



200 



100 



ES 



100 200 300 400 500 600 700 80Q 900 1000 MILES 



Fig. 2. 



carrying out tests with the Arlington station. Successful observa- 

 tions with the electrolytic detector were made in the daytime up to 

 1,920 nautical miles, while by other detecting devices not sufficiently 

 quantitative for measurement purposes, messages were read up to 



