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Original file ‎(3,276 × 2,668 pixels, file size: 25.07 MB, MIME type: image/tiff, 2 pages)

Summary

Photograph of Beckman Model DB Spectrophotometer   (Wikidata search (Cirrus search) Wikidata query (SPARQL)  Create new Wikidata item based on this file)
Photographer
UnknownUnknown
Title
Photograph of Beckman Model DB Spectrophotometer
Description

Photograph of Beckman Model DB Spectrophotometer

The Beckman DB was a double beam model, made by Beckman Instruments, which allowed for comparison between two light paths: a reference and the sample being measured.

Published without a copyright notice in Beckman Instruments Feedback newsletter, April 1960 (box 44, folder 34)
Date 1960
date QS:P571,+1960-00-00T00:00:00Z/9
institution QS:P195,Q5090408
Accession number
Beckman Historical Collection
Credit line Science History Institute.
Notes Image downloaded with permission from the Science History Institute, as part of the Wikipedian in Residence initiative.
Source https://digital.sciencehistory.org/works/8g84mm32q
Permission
(Reusing this file)
This work is in the public domain in the United States because it was published in the United States between 1929 and 1977, inclusive, without a copyright notice. For further explanation, see Commons:Hirtle chart as well as a detailed definition of "publication" for public art. Note that it may still be copyrighted in jurisdictions that do not apply the rule of the shorter term for US works (depending on the date of the author's death), such as Canada (50 p.m.a.), Mainland China (50 p.m.a., not Hong Kong or Macao), Germany (70 p.m.a.), Mexico (100 p.m.a.), Switzerland (70 p.m.a.), and other countries with individual treaties.

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c1f8b34bdc4ee714b2440954538d36a10487647b

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Date/TimeThumbnailDimensionsUserComment
current13:29, 6 August 2019Thumbnail for version as of 13:29, 6 August 20193,276 × 2,668, 2 pages (25.07 MB)Mary Mark Ockerbloom== {{int:filedesc}} == {{Photograph |photographer ={{unknown}} |title = Photograph of Beckman Model DB Spectrophotometer |description = Photograph of Beckman Model DB Spectrophotometer The Beckman DB was a double beam model, made by Beckman Instruments, which allowed for comparison between two light paths: a reference and the sample being measured. Published without a copyright notice in Beckman Instruments ''Feedback'' newsletter, April 1960 (box 44, folder 34)...
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source: http://en.wikipedia.org/wiki/File:Beckman_model_db_n009w2543.tiff