188 Audibility Factor of a Shunted Telephone. 



factors from 160 to 4) our experiments indicate the relation 



S 



I 2 , 



for between these limits the curve is a straight line with an 

 inclination angle = tan -1 '5. 



Fig-. 2. 



•2 -4 -8 -8 1.0 i.2 I A 16 1.8 2.0 



For values o£ log (R + S)/S from '08 to -6, i, e. for values 

 of (R + S)/S from 4 to 1% the audibility factor is propor- 

 tional to a power of I ranging in this interval from 2 to '7. 



Summary. 



The assumption that the audibility factor of a shunted tele- 

 phone is in general proportional to the square of the antenna 

 current, as stated by Hogan, seems to be invalid. For large 

 values of the current we found a proportionality between the 

 audibility factor and the square of the current, and for 

 weaker signals the audibility factor was found to be pro- 

 portional to a power of the current varying between 2 

 and -7, in agreement with Love's expectations. 



The author hopes to pursue these investigations further 

 and to give an account of the results arrived at, 



In conclusion, I should like to express my thanks to 

 Prof. J. A. Fleming for the facilities afforded to me for 

 conducting the experiments here described in his laboratory. 



Pender Electrical Laboratory, 



University Coll 



2.1 



»'e ? London. 



