152 BELL SYSTEM TECHNICAL JOURNAL 



Results of Noise Surveys. Part II. Noise in Buildings.'' R. S. 

 Tucker. Noise experienced indoors is in one sense more important 

 than that experienced outdoors, for, with the growth of our industrial 

 civiUzation, increasing numbers of people are spending most of their 

 waking hours indoors. They are thus exposed to indoor noise for a 

 large part of the time, including the hours of work when noise has its 

 opportunity to impair their working efificiency. 



Certain typical values for noise in various locations in buildings 

 have been published, and are summarized in this paper. Our knowl- 

 edge of indoor noise levels is far from complete, however. Further 

 information has been obtained in a survey of room noise in New York 

 City and the surrounding area which was made in 1929 by the National 

 Electric Light Association and the American Telephone and Tele- 

 graph Company in the course of the work of their Joint Subcommittee 

 on Development and Research. Some results of the New York City 

 measurements are given. About 70 test locations are included. It 

 will be realized that this is only a small sample of the total number of 

 places where indoor noise is experienced in New York City alone. The 

 conclusions given must therefore be regarded only as suggestive rather 

 than as holding true in any general sense. 



' Jour. Acous. Soc. America, July, 1930. 



