Credit: Royal Society
    Image number: RS.22023

    Parallax experiment

    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 fourth 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 man observing a small object with each eye in turn and noting the position it appears relative to the background.

    The robed man is assisted by three putti, male childlike angels, and is kneeling by an ornate table. He is holding a rod topped with a small sphere on the table and is focussing on the sphere with one eye at a time. The experiment demonstrates the phenomenon of parallax, where the position of an object appears to shift relative to its surroundings when viewed from a different angle.

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

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