206 ANNUAL REPORT SMITHSONIAN INSTITUTION, 1924 



The high degree of faithfuhiess of reproduction realized in this 

 loud speaker is due partly to the absence of a horn, eliminating horn 

 resonance (one of the usual sources of distortion in a speech repro- 

 ducer), and partly to the method of vibrating the diaphragm by 

 forces which are distributed fairly uniformly over its surface, in- 

 stead of acting upon it in a very limited region, as is the case in most 

 other loud speakers. This feature eliminates rattling and ringing 

 of the diaphragm or the production of high overtones by the dia- 

 phragm vibrating in its partial nodes. 



