
How loud is the noise : sound levels indicated in decibels and in units of sounds energy
Diagram shows how many decibels or units occur in the average office, in addition to other sounds, such as a whisper or thunder.
1934-07-22
13 x 9.2 cm
Tribune Company
grayscale
- English
- still image
- text
- These materials are either in the public domain, according to U.S. copyright law, or permission has been obtained from rights owners. The digital version and supplementary materials are available for all educational uses worldwide.
- The Janet A. Ginsburg Chicago Tribune Image Collection
- Chicago Sunday Tribune (July 22, 1934), p. 6
- application/pdf
- image/jpeg
- Electronics

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