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Cartesian devil


  • Webster's Revised Unabridged Dictionary
    • Cartesian devil a small hollow glass figure, used in connection with a jar of water having an elastic top, to illustrate the effect of the compression or expansion of air in changing the specific gravity of bodies.
    • Cartesian devil See under Cartesian.
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Chambers's Twentieth Century Dictionary
    • Cartesian devil a scientific toy named after Descartes, illustrating the principle of specific gravity
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