Bunsen's Photometer

descriptionPublicationkeyboard_double_arrow_right Article 01 Jun 1889 English Publisher:Springer Science and Business Media LLCJournal:Nature, volume 40, pages 174-174 (issn: 0028-0836, eissn: 1476-4687,

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Authors: Lewis, D. M.;

doi: 10.1038/040174d0

Bunsen's Photometer

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Abstract

IF we place the “grease spot” screen between two sources of light, situated at A and B, whose intensities are I and I′ respectively, and if C be the position of the screen for which the spot disappears when viewed from the side towards A, and C′ the corresponding position when viewed from the other side, it is usual to say: Take the mean of AC and AC′, and the mean of BC and BC′; the squares of the means will be approximately proportional to the intensities.

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