Smithsonian Report, 1908. — Fessenden. 



Plate 19. 



Fig. 1 .— Part of Interference Preventer to Eliminate Disturbances 

 IN Receiver. 



Fig. 2.— Wheatstone Transiviitter Used in Capacity Test of Wireless Lines. 



Fig. 3.— Talking by Relays from a Local Circuit. 



