The observations, so numerous and so important, of the pendulum as object are especially relevant to the length of its oscillations. Those that I propose to make known to the [Paris] Academy [of Sciences] are principally addressed to the direction… — Leon Foucault Copy Share Image
![“The observations, so numerous and so important, of the pendulum as object are especially relevant to the length of its oscillations. Those that I propose to make known to the [Paris] Academy [of Sciences] are principally addressed to the direction of the plane of its oscillation, which, moving…” quote by Leon Foucault](https://sms4smile.com/quotes/img-quotes/e85/leon-foucault-85526_academy_the-observations-so-numerous-and-so-impo_870149.jpg)