File:Beckman model db n009w2543.tiff

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current13:29, 6 August 2019No thumbnail3,276 × 2,668 (25.07 MB)wikimediacommons>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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