It is used to study the stationary waves generated in a chord attached by both extremities.
It consists of a wooden box with parallelepipedal shape and with an attached ruler to which a chord is attached (connected by one of its extremities and to a weight by the other) resting on two mobile easels. The group is completed with another mobile easel.
This instrument was invented about 1830 by Félix Savart, a French physicist specialized in acoustics. Today, he is specially remembered by his works on magnetic fields.