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

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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/

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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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current01:18, 18 September 2015Thumbnail for version as of 01:18, 18 September 2015766 × 1,266 (213 KB) (talk | contribs)== {{int:filedesc}} == {{subst:chc}} {{information |description={{en|1=<br> '''Identifier''': belltelephonemag18amerrich ([https://commons.wikimedia.org/w/index.php?title=Special%3ASearch&profile=default&fulltext=Search&search=insource%3A%2Fbelltelepho...

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