The phenomenon develops calmly, but it is invisible, unstoppable. One feels, one sees it born and grow steadily; and it is not in one's power to eith…

- Leon Foucault

The observations, so numerous and so important, of the pendulum as object are especially relevant to the length of its oscillations. Those that I pro…

- Leon Foucault

Science gains from it [the pendulum] more than one can expect. With its huge dimensions, the apparatus presents qualities that one would try in vain …

- Leon Foucault