132 



PROCEEDINGS OF THE AMERICAN ACADEMY. 



Phase in Figure 4. The angles plotted in this curve were obtained by 

 taking the antitangent of the ratio of motional reactance to motional 



TABLE IX. 

 Values of Power. Bell Bipolar Bh at 0.42 Volt. 



resistance and plotting the result, which is phase of motional imped- 

 ance, against angular velocity. The meaning of this phase angle will 

 be made plainer in the discussion of the circular graphs to follow. 

 Application to Sound Experiments. — It may be noted, in pass- 



