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Prince Rupert's Drop

Samuel Pepys, who attended a demonstration of this curious 17th century novelty, described it as “one of the greatest wonders I ever saw”. So, what is it?

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Remo Giuffré
Feb 04, 2026
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Depiction of glass drops from Robert Hooke’s Micrographia (1665) > Portrait: Prince Rupert of the Rhine by Peter Lely

The 17th century was a time in history when Europe was obsessed with both scientific discovery and spectacular demonstration. Enter Prince Rupert of the Rhine: soldier, privateer, nephew of King Charles I and enthusiastic dabbler in natur…

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