## An essay on Newton's Principia |

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### Contents

Introductory | 1 |

The Portsmouth draft circ 1714 on Newtons investigations | 7 |

Law of centripetal force to the centre in a circular orbit | 13 |

Copyright | |

12 other sections not shown

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### Common terms and phrases

adeo apse line attraction axis body move Brewster calculations Cambridge celeritas celestial motions centre centripetal force circular motion comets conic copy corpus Cotes Correspondence curve David Gregory demonstration density distance distantiae diurnal motion duplicate proportion earth ellipseos ellipsis equal essay Flamsteed fluid focus force varying inversely force which varies geometrical progression given point Halley to Newton Halley's Hooke to Newton Hooke's hyperbola hypothesis Invenire inverse square Isaac Newton June June 20 lectures Lemma linea London manuscript mathematical medii moon moon's motion of bodies Motu Newton to Halley Newton's letter orbit parabola particle Pemberton pendulum perpendicular philosophy planets Portsmouth Collection Principia printed Prop propositions quae quam quod ratio reciprocally recta resistentia Rigaud Rouse Ball Royal Society says Scholium second edition Section sphere sunt supposed tangent temporis theory third book third edition Trinity Trinity College tryalls umbilicus velocity