XVI THE ROYAL SOCIETY OF CANADA 



was altered lamps were made to "wink" in a manner analogous to 

 beating forks. An account was given of the Edison effect and of the 

 evolution of the diodes and triodes of various nations. The Duddell 

 singing arc was exhibited as an illustration of arc transmission. 



The Radio Branch of the Department of the Naval Service, 

 through the kindness of the Lieutenant Commander Edwards, the 

 Director of that Branch, arranged to fit up a complete set of 

 receiving apparatus in the ballroom and to suspend an aerial from an 

 adjacent building. Signals were rendered audible to the whole of the 

 audience by means of a loud speaking magnavox telephone. During 

 the course of the lecture, complimentary messages to the Royal 

 Society were received from the Kingston, Ont., Coast Station, and 

 the Barrington, N.S., Naval Station, and signals were received from 

 the following stations among others: Montreal, 2 K. W. Spark 600- 

 meters; steamers off New York and on the Great Lakes, Spark 600 

 meters; New Brunswick, Alexanderson alternator, 13,600 meters; 

 Annapolis, Md., Arc, 17,000 meters; Barrington Passage, Nova 

 Scotia, Arc, 4,000 meters; Kingston, Ont., Spark, 600 meters. 



By the kindness of the Marconi Wireless Telegraph Company 

 of Canada, radio telephone transmitters were installed at the Naval 

 test room, Ottawa, and at the Marconi works in Montreal. 



Miss Lutton, of Montreal, sang into the transmitter at that 

 point and her voice was well heard at Ottawa in the telephone receivers, 

 and, with the assistance of the loud speaking telephone above men- 

 tioned, was rendered audible to the whole audience. It is believed 

 that this is the first occasion upon which a large audience has, by 

 means of the wireless telephone, received speech through space over a 

 distance exceeding a hundred miles. The articulation was, to some 

 extent, impaired by reason of the many amplifications necessary to 

 operate the loud-speaking telephone. Trouble was also present due 

 to atmospheric disturbances, which were severe at the time. Never- 

 theless, the experiment was sufficiently successful to demonstrate the 

 potentialities of the radio telephone, the more so, as owing to the 

 conditions under which the lecture was given, a rehearsal was im- 

 possible and the audience had the interesting experience of seeing the 

 experiments carried out for the first time, during the lecture. The 

 telephonic speech, gramaphone music, etc., received from the wireless 

 telephone transmitter installed at the Naval test room at Ottawa was 

 excellent as in this case, owing to the strength of signals it was possible 

 to receive on a small loop and thus eliminate local interference and 

 atmospherics. 



