A Treatise on the Motion of a Single Particle, and of Two Particles Acting on One Another

accelerating effect action angle apse apsidal attracted axes axis balls begins body called center of force center of gravity co-ordinates considered constant constraint continually curve denote described differential direction distance drawn dt dt ellipse equal equations of motion exerts expressed fixed fixed point force acting given gives heavy Hence impact initial instant integrating intensity inversely length less limit mass measured moving moving effect Multiplying normal opposite orbit origin parallel particle passing path periodic perpendicular plane of motion positive positive side produce projection proportional quantity radius relative plane represented resistance respectively rest result side similar space square straight line supposed surface taken tangent tends third tion unit values vertical