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File:Photometer devised by Beer.jpg

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Photometer_devised_by_Beer.jpg (475 × 240 pixels, file size: 26 KB, MIME type: image/jpeg)

Description
English: Light from the lamp at the right-hand side passes through an absorption cell, whereas the lamp at the left-hand side is a reference source. The photometer is adjusted so that the observed intensities from the two light sources are equal.
Date
Source

Original publication: 1855

Immediate source: http://www.canberra.edu.au/irps/archives/vol21no1/blbalaw.html
Author

August Beer

(Life time: 31 July 1825 – 18 November 1863)


Public domain
This work is in the public domain in the United States because it was published (or registered with the U.S. Copyright Office) before January 1, 1929.
Public domain works must be out of copyright in both the United States and in the source country of the work in order to be hosted on the Commons. If the work is not a U.S. work, the file must have an additional copyright tag indicating the copyright status in the source country.
Note: This tag should not be used for sound recordings.PD-1923Public domain in the United States//commons.wikimedia.org/wiki/File:Photometer_devised_by_Beer.jpg

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current22:18, 6 February 2013Thumbnail for version as of 22:18, 6 February 2013475 × 240 (26 KB)Nbenway{{subst:Upload marker added by en.wp UW}} {{Information |Description = {{en|Light from the lamp at the right-hand side passes through an absorption cell, whereas the lamp at the left-hand side is a reference source. The photometer is adjusted so that t...

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