File:Bell telephone magazine (1922) (14733654466).jpg

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English:

Identifier: belltelephonemag18amerrich (find matches)
Title: Bell telephone magazine
Year: 1922 (1920s)
Authors: American Telephone and Telegraph Company American Telephone and Telegraph Company. Information Dept
Subjects: Telephone
Publisher: (New York, American Telephone and Telegraph Co., etc.)
Contributing Library: Prelinger Library
Digitizing Sponsor: Internet Archive

View Book Page: Book Viewer
About This Book: Catalog Entry
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Text Appearing Before Image:
Till, Tanukm (ii oi Six Riiumhk Antewas oi the Experimental MusA System at IIoi mdm. GEOGRAPHY OF BELL TELEPHONE LABORATORIES tion. A wide open space was required. For the experiment asmall sound source was placed at the center of a 100 ft. squareconcrete platform. This resulted in a progressive hemispheri-cal wave which was used to make measurements of the direc-tional characteristics of sound perception of the human earand also to study certain diffraction problems related to micro-phone baffles.
Text Appearing After Image:
PLEASANTGROVE CHESTER • • • LONGVALLEY

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https://www.flickr.com/photos/internetarchivebookimages/14733654466/

Author Internet Archive Book Images
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(Reusing this file)		 At the time of upload, the image license was automatically confirmed using the Flickr API. For more information see Flickr API detail.
Volume
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18
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Flickr posted date
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27 July 2014

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18 September 2015

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