Fabri, Honoré, Tractatus physicus de motu locali, 1646

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1
APPENDIX PRIMA
PHYSICOMATHEMATICA,
De centro percuſsionis.
DE duplici centro hactenus actum eſt,
magnitudinis, ſcilicet, & grauitatis;
præſertim de hoc vltimo:
in quo certè
opere non ſine maxima laude præ­
ſtantiſſimi Mathematici deſudarunt,
ſcilicet Archimedes, Commandinus, Lucas Vale­
rius, Steuinus, Guldinus, Galileus paucis:
ſed du­
plex aliud centrum conſiderari poteſt;
primum di­
citur centrum impreſſionis: vtrumque prorſus inta­
ctum aliis doctâ paucarum licèt propoſitionum co­
ronâ, vel peripheria in hac appendice corona­
mus.
DEFINITIO I.
CEntrum grauitatis eſt punctum, quod omnia grauitatis momenta æqua­
liter dirimit.
Clara eſt definitio; centrum enim grauitatis eſt illud punctum, ex
quo pendulum corpus per quamlibet lineam ſeruat æquilibrium.
Definitio 2.
Centrum impreſſionis eſt illud, per quod, ſi ducatur planum vtrimque, di­
rimit æqualem impetum.
Hæc etiam clara eſt; conſideratur autem impetus non modò ratione