ROOM NOISES IN TELEPHONE LOCA TIONS 667 



Conclusions and Acknowledgment 



While a certain amount of work on room noise conditions in tele- 

 phone locations had been previously carried out, this survey represents 

 a considerable advance in knowledge of room noise magnitudes. It 

 provides data for work on the effects of noise on telephone transmission 

 as well as furnishing certain information of wider interest. The meth- 

 ods of measurement employed, when further developed in the light of 

 the experience gained in this work, should prove valuable in other room 

 noise investigations. 



The authors wish to acknowledge the work of Messrs. J. W. Whit- 

 tington and R. E. Philipson of the National Electric Light Association 

 and Messrs. J. M. Barstow and R. S. Tucker of the American Tele- 

 phone and Telegraph Company, in designing and building the room 

 noise meter and in carrying out the survey. 



