136 



PROCEEDINGS OF THE AMERICAN ACADEMY. 



Figure 9. Circular graph for watch-case recover with 0.3 volt at terminals. 

 Diameter 47 ohms. Depression angle (2/3) 93°. wq = 5820 radians per 

 second, a = 150j Small circles observed. Internal ring numbers computed. 



Figure 10. Circular graph for experimental monopolar receiver, with 0.3 

 volt at terminals. Diameter 185.4 ohms. Depression angle (2/3) 21.5°. 

 Wo = 6448 radians per second, a = 20. Small circles observed. Internal 

 ring numbers computed. 



