pˈɔɪnsɑːt wʌzɐ kəntˈɛmpɚɹˌɛɹi ʌv lˈeɪɑːn fˈaʊkɔlt, hˌuː ɪnvˈɛntᵻd ðə dʒˈaɪɹəskˌoʊp ænd hˌuːz pˈɛndʒuːləm ɛkspˈɛɹɪmənts pɹəvˈaɪdᵻd ɪŋkˌɑːntɹəvˈɜːɾᵻbəl ˈɛvɪdəns ðætðɪ ˈɜːθ ɹoʊtˈeɪts.
Poinsot was a contemporary of Léon Foucault, who invented the gyroscope and whose pendulum experiments provided incontrovertible evidence that the Earth rotates.