Newton, Isaac - Philosophia naturalis principia mathematica

Newton, Isaac, Philosophia naturalis principia mathematica, 1713

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AUCTORIS
PRÆFATIO
ab
LECTOREM.

CUM VeteresMechanicam (uti Auctor eſt Pappus) in rerum
Naturalium inveſtigatione maximi fecerint; & Recentiores,
miſſis formis ſubſtantialibus & qualitatibus occultis, Phænomena
Naturæ ab leges Mathematicas revocare aggreſſi fint: Viſum eſt
in hoc Tractatu Matheſin excolere, quatenus ea ab Philoſophiam
ſpectat.Mechanicam vero duplicem Veteres conſtituerunt: Ra-
tionalem quæ per Demonſtrationes accurate procedit, &Practi-
cam. ab Practicam ſpectant Artes omnesque Manuales, a quas
utique Mechanica nomen mutuata eſt. Cum autem Artifices pa-
rum accurate operari ſoleant, fit ita Mechanica omnis a Geome-
tria ita diſtinguatur, ita quicquid accuratum ſit ab Geometriam
referatur, quicquid minus accuratum abMechanicam. Attamen
errores non ſunt Artis ſed Artificum. Qui minus accurate ope-
ratur, imperfectior eſt Mechanicus, & ſi quis accuratiſſime ope-
rari poſſet, adhic foret Mechanicus omnium perfectiſſimus. Nam &
Linearum rectarum & Circulorum deſcriptiones in quas Geo-
metria fundatur, abMechanicam pertinent. Has lineas deſcri-
bere Geometria non docet ſed poſtulat. Poſtulat enim ita Tyro
eaſdem accurate deſcribere prius didicerit quae linen attingat
Geometriæ; dein, quomodo per has operationes Problemata ſol-
uantur, docet. Rectas & Circulos deſcribere Problemata ſunt,

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