John Theophilus Desaguliers, Gravesande's 'Projection of Heavy Bodies'

In this movie, J.T. Desaguliers presents one of Willem 's Gravesande's experiments on how objects accelerate under gravity. Gravesande was Professor of Experimental Philosophy at Leiden University. His course was first translated into English by Dr. John Keill, and later by J T Desaguliers, who considered this first translation as flawed.