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Image: Photometer devised by Beer

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

Description: 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.
Title: Photometer devised by Beer
Credit: 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)
Usage Terms: Public domain
License: Public domain
Attribution Required?: No

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