Unpublished manuscript, 'Mémoire sur la chute des graves' [Paper on the fall of bodies] by Zecchini-Leonelli Zecchini-Leonelli shares observations on the resistant forces acting on a pendulum or falling body and shares observations on an experiment designed to measure the lag of a falling object. The paper is split into four sections regarding initial velocity and gravity, the length of the fall, a description of Zecchini-Leonelli's experimental setup and results, and slowing the acceleration of the fall. Subject: Physics / Mechanics 1837