Show FOE gibli LITTLE FOL KS the apple appl pendulum at dessert it Is possible by mean inse we of an apple or an to repeat the th foncault u pendulum experiment which waa executed under the domo dome af 6 the pantheon in 1831 ran pass a match through throng h an su orange aad inid allow the ends end to protrude on each tide side mid and to one of these theme ends endi attach a thread attach the other extremity of the thread to the head of a pin inserted in a cork and support the latter ly means of three forks the handles of which rest u upon pon the edge of a plate now cause the pendulum to swing after so BO regulating the length of the thread that the lower point of the match snail shall come very tear near tho the bottom of the plate and mark its passage in two small email circular piles of powdered sugar designed to represent the circle of sand that foncault arranged upon the ground all around his pendulum the plate represents the earth As long as it remains stationary the match at every oscillation will pass exactly through the furrow that it has made in the two piles of sugar if in order to represent the rotary motion of the earth we gently revolve the plate and consequently the forks and cork we find that that has no influence upon the pendulum which continues to oscillate in the same plane as before and we have a proof of this in seeing the match at every oscillation make a small furrow distinct from the proceeding we can thus demonstrate in a simple and practical matter manner the principle of the invariability of the plane of oscillation of the pendulum upon which was based the celebrated experiment of the french scientist electrical age |