I see I shouldn't have let the article's reference to stones stand; the specific experimental apparatus used by both sides was lead balls -- Galileo rolled them down inclined planes, while his opponents dropped them from the Leaning Tower of Pisa.

The article lost me when the author blithely claimed that it was Galileo who dropped two <droppable-item>s from the Leaning Tower of Pisa. The author clearly has no idea what happens when you do that; while Galileo was far too good at choosing the experimental setup that would give him the answer he wanted, while ignoring any such setup that would prove him wrong, to make such an obvious mistake.