Clocks: an escapement mechanism (top), and a pendulum (below). Engraving by E. Kennion after C. Varley.

    • Varley, Cornelius, 1781-1873.
    Reference:
    40937i

    Licence: Public Domain Mark

    Credit: Clocks: an escapement mechanism (top), and a pendulum (below). Engraving by E. Kennion after C. Varley. Wellcome Collection. Source: Wellcome Collection.

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