Jean de Hautefeuille
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Jean de Hautefeuille (1647-1724) was a French abbé, physicist and inventor.
In the 1670s, he was involved in a dispute with Christian Huygens as to who had first invented the balance-spring used in watches. Today, Huygens is generally credited with the invention, as his implementation was considerably more advanced. [1]
In 1678, he was again involved with Huygens, as Huygens successfully constructed a primitive internal combustion engine based on de Hautefeuille's suggestion.
He also made advances in the study of lenses and echoes, and invented the thalassameter. [2]
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