NEW CONCEPTIONS IN SCIENCE 



any number of messages at the same station simul- 

 taneously. That is chiefly due, again, to Professor 

 Lodge. 



He has contributed but little to the scientific side 

 of the subject, or to the explanation of the working 

 of these mysterious waves. Here, along with the 

 many investigators already named, stand, in front 

 line, Professor Fleming, of London; Poincare an,d 

 Turpain, of Paris; and, on the more practical side, 

 Lieutenant Tissot, of Brest. 



He has, since the Salisbury Plain trials with kites, 

 taken to the water wholly. The work of making 

 wireless telegraphy practicable on land has been 

 mainly carried on by Slaby and Arco, and Professor 

 Braun, and, with his ingenious " relays," by Guarini, 

 of Brussels. 



And the Marconi system is but one of a score. 

 There are two from Russia, two or more from Ger- 

 many, one from France, one in Spain, several in 

 England how many in this country, 'twould be 

 hard to count. The De Forest system, worked out 

 on new and original lines by Dr. Lee de Forest, is 

 one of the most successful now in use. The Weath- 

 er Bureau has been experimenting for some time 

 with the system worked out by Professor R. A. 

 Fessenden, of Pittsburg, and this is said to have 

 been going successfully, along the coast, at dis- 

 tances reaching one hundred and fifty miles. The 



