Credit: Royal Society
    Image number: RS.22024

    Inverse-square law

    Date
    1613
    Creator
    Theodor Galle (1571 - 1633, Flemish) , Engraver
    After
    Peter Paul Rubens (1577 - 1640, Flemish) , Draughtsman
    Object type
    Library reference
    RCN 24525
    Material
    Technique
    Subject
    Physics
       > Optics
    Description
    Illustration from the title page of the fifth book of Opticorum libri sex (Six Books of Optics) by Flemish mathematician and physicist François d'Aguilon (1567-1617). The vignette, engraved after an original drawing by Peter Paul Rubens, shows a demonstration of the inverse-square law.

    A robed man, assisted by two putti, male childlike angels, is shown observing the intensity of light from two distinct sources. A lamp with a single flame is seen on an ornate table and is arranged to cast a circle of light on board at the left edge of the image. A brighter lamp, with two flames, is held further away by one of the putti but casts a circle of light with the same intensity.

    François d'Aguilon (1567-1617), Flemish mathematician and physicist, was not a Fellow of the Royal Society.

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