Credit: © The Royal Society
    Image number: RS.10045
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    Colours in layers of mica and glass

    Date
    1807
    Creator
    James Sowerby (1757 - 1822, British) , Naturalist
    Object type
    Library reference
    Tracts/X40/21
    Material
    Technique
    Dimensions
    height (print): 258mm
    width (print): 208mm
    Subject
    Physics
       > Optics
    Description
    Colours observed within layers of mica (figures a-f) with concentric circles of sixteen colours based upon Isaac Newton’s observation of colours produced at the contact of two telescope object-glasses (figure g).

    Plate 1 from the monograph A new elucidation of colours, original prismatic, and material; showing their coincidence in three primitives, yellow, red and blue..., by James Sowerby (London, Richard Taylor and Co., 1809). Inscribed “Tab.1” top right and “Oct.1.1807.Publish’d by Jas. Sowerby London.”
    Associated place
    <The World>
       > Europe
          > United Kingdom
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