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.
Article PDF
Author information
Authors and Affiliations
Rights and permissions
About this article
Cite this article
LEWIS, D. Bunsen's Photometer. Nature 40, 174 (1889). https://doi.org/10.1038/040174d0
Issue Date:
DOI: https://doi.org/10.1038/040174d0
Comments
By submitting a comment you agree to abide by our Terms and Community Guidelines. If you find something abusive or that does not comply with our terms or guidelines please flag it as inappropriate.