Reconstruction In progress
Madrid Codex, folio 91v
Triple mechanical drum with six sticks actuated by a single toothed cylinder itself actuated by a large toothed wheel. This drawing is clearly theoretical, but lets easily imagine the sound masses that this mechanism will produce by its movement.
It consists a large drum with one flap, a medium-sized drum with two flaps, as well as a smaller one with three flaps.
It was probably intended for use scenic.