Galileo's ship

I've seen debates about whether Galileo actually conducted certain experiments or not.  On page 297 of The Tuscan Artist, Greco says that the ship experiment, in which an object is tossed straight upward on a steadily moving ship, only to fall at the feet of the person who tossed it, was performed in 1624. I hope it's true.  He cites some works be L. Conti (1990), which were written in Italian.