File:Bell telephone magazine (1922) (14756122642).jpg

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Description
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
Click here to view book online to see this illustration in context in a browseable online version of this book.

Text Appearing Before Image:
or switching,information services, and the transmission of largevolumes of visual information. How is a hologram made? One way to answer thisquestion is to compare how an ordinary photographis made with the means of making holograms. When taking a conventional picture, the subject isusually illuminated by sunlight or light from a lamp.An image of the subject is formed by a lens focusedon photosensitive film that records the image byresponding to the intensity of light reflected from thesubject. A black and white photograph, therefore, ismade up of black, gray and white tones that corre-spond to variations in brightness of the subject. Holography, however, differs in two basic ways:(1) no lens or image-forming device is needed be-cause no focused image is formed on the hologram,and (2) the object must be illuminated by coherentlight, such as that provided by a laser. The use ofcoherent light enables special patterns of light wavesto be recorded on the film, in addition to variations 17
Text Appearing After Image:
Bell Laboratories Larry H. Lin (letl) and Ken Poole makethe multicolored hologram which is seen on the preceding page. in brightness. (Coherent light, which contains lightwaves of nearly a single wavelength, provides a scalefor measuring the distance the light has traveled andthe direction from which it came.) A hologram records a visual pattern produced bythe interaction of two coherent light waves from thelaser: one that is used to illuminate the holographicplate, and the other to illuminate the subject. Lightwaves that illuminate the subject reflect back to theplate and interact with the first light wave on thehologram. This interaction of light waves producesa combination of lines, specks and whirls which maylook like an out-of-focus fingerprint or a smudgedor darkened photo negative. When this combination of smudges is illuminated— either by another laser beam or a beam of lightfrom the sun or a flashlight — the original subjectwill appear in three dimensions, apparently floa

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https://www.flickr.com/photos/internetarchivebookimages/14756122642/

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
Flickr tags
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Flickr posted date
InfoField
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@N07/14756122642. It was reviewed on 17 September 2015 by FlickreviewR and was confirmed to be licensed under the terms of the No known copyright restrictions.

17 September 2015

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