rkbrooks

Hi All, First post here, please be kind. I recently visited the Musée des Arts et Métiers during a trip to Paris- which btw, is very nice- a little short of explanations, but what a collection! In any case, they had, what I assume, is an original version of the Fizeau-Foucault apparatus. The rotating mirror mechanism was pneumatic, and I was wondering what sort of RPM this thing could achieve? Now, I can calculate what type of displacement they'd get on a return beam based on distance and angular speed, but I only can find a reference to the distance (20 miles one-way). TIA for any insight or references! -Ryan