File:Bell telephone magazine (1922) (14569850718).jpg

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English:

Identifier: belltelephone6667mag00amerrich (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
View All Images: All Images From Book
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Text Appearing Before Image:
ion watts. Bell Labs scientists at Murray Hill have generated worlds shortest pulses (less than one picosecond) and devised technique to measure them. Pulses provide a yardstick of a size compatible with events on the atomic scale and enable scientists to examine motions of molecules in liquidf and solids. Picture shows invisible laser beam hitting crystal, which converts infra red to brilliant green spark. Somewhat similar technique involving a non-linear effect permits measurement of pulse widths Experimental laser communications transmission system uses gas lenses to focus beam. This pilot model operated by H. W. Astle, aimed at development of an eventual 4,000-mile line, uses ordinary air in each lens; by varying rate of air flow through heated tube centered inside sections of copper pipe, beam can be focused Invented at 0 ■ ,m; focused sharply over distances with almost no loss in energy, which is not possible with glass or quartz optics.
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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
InfoField
45-46
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Flickr posted date
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27 July 2014

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This image was originally posted to Flickr by Internet Archive Book Images at https://flickr.com/photos/126377022@N07/14569850718. It was reviewed on 17 September 2015 by FlickreviewR and was confirmed to be licensed under the terms of the No known copyright restrictions.

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