Tracts: Containing Mechanics, Or The Doctrine Of Motion; The Projection Of The Sphere; The Laws Of Centripetal And Centrifugal Force (1793) is a book written by William Emerson. The book is a collection of three tracts that cover various topics related to mechanics and physics. The first tract, Mechanics, discusses the doctrine of motion and explains the laws of motion as formulated by Sir Isaac Newton. The second tract, The Projection of the Sphere,...