Newton's Laws of Motion, with their consequences-as Measure of Time, Parallelogram of Forces, Conservation of Momentum and of Moment of Momentum, &c. $$ 58-67.
Scholium to the Third Law, with its interpretation. D'Alem- bert's principle, Horse-power, Conservation of Energy in Ordinary Mechanics, §§ 68-70.
Conservation of Energy, Impossibility of Perpetual Motion, Joule's experimental results, §§ 71-73".
Inverse problem-To find the equation to the con- straining curve when the time of descent, to the lowest point, through any arc, is given as a func- tion of the vertical height fallen through.