Credit: ©The Royal Society
    Image number: RS.18178

    Prince Rupert’s drops

    Unknown, Engraver
    Robert Hooke (1635 - 1703, British) , Natural Philosopher
    Object type
    Library reference
    RCN 45230
       > Optics
          > Microscopy
    Microscopic study of toughened glass beads, or Prince Rupert’s drops. The beads were the result of dropping molten glass into cold water. In the top right [as viewed] are the thin glass pipes that were melted and in the bottom left are the glass beads themselves; tadpole-shaped droplets with a long thin tail.

    The Prince Rupert drop was named after Prince Rupert of Rhine (1619-1682) who brought them to England in 1660. The Royal Society studied them as a scientific curiosity. Their description here highlights certain of their key properties, including: ‘That the parts of the Glass, whils in a fluid Consistence and hot, are more rarified or take up more room, then when hard and cold’ and a simultaneously ‘hard, brittle and springy texture’.

    Inscribed above: ‘Schem IIII’

    Plate 4 from Robert Hooke’s Micrographia: or some physiological descriptions of minute bodies made by magnifying glasses with observations and inquiries thereupon (1665), the first fully-illustrated book on the topic of microscopy. In the preface Hooke asserts that he had discovered ‘a new visible World’.

    Robert Hooke (1635-1703) British natural philosopher was a founding member of the Royal Society, elected in 1663. Before his career with the Royal Society, Hooke had been apprenticed to painter Peter Lely (1618-1680), where he learned to draw and paint. Though he did not engrave the images in Micrographia himself they were engraved after his illustrations.
    Associated place
    <The World>
       > Europe
          > United Kingdom
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