Newton, Isaac, Philosophia naturalis principia mathematica, 1713

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1virium æſtimatæ, ſunt reciproce ut vires. Sie pondera æquipollent
ad
movenda brachia Libræ, quæ oſcillante Libra ſunt reciproce ut
eorum
velocitates ſurſum & deorſum: hoc eſt, pondera, ſi recta
aſcendunt
& deſcendunt, æquipollent, quæ ſunt reciproce ut pun­
ctorum
a quibus ſuſpenduntur diſtantiæ ab axe Libræ; ſin planis
obliquis
aliiſve admotis obſtaculis impedita aſcendunt vel deſcen­
dunt
oblique, æquipollent quæ ſunt reciproce ut aſcenſus & deſcen­
ſus
, quatenus facti ſecundum perpendiculum: id adeo ob determi­
nationem
gravitatis deorſum.
Similiter in Trochlea ſeu Polyſpaſto
vis
manus funem directe trahentis, quæ ſit ad pondus vel directe
vel
oblique aſcendens ut velocitas aſcenſus perpendicularis ad ve­
locitatem
manus funem trahentis, ſuſtinebit pondus.
In Horolo­
giis
& ſimilibus inſtrumentis, quæ ex rotulis commiſſis conſtructa
ſunt
, vires contrariæ ad motum rotularum promovendum & impe­
diendum
, ſi ſunt reciproce ut velocitates partium rotularum in quas
imprimuntur
, ſuſtinebunt ſe mutuo.
Vis Cochleæ ad premendum
corpus
eſt ad vim manus manubrium circumagentis, ut circularis
velocitas
manubrii ea in parte ubi a manu urgetur, ad velocitatem
progreſſivam
cochleæ verſus corpus preſſum.
Vires quibus Cu­
neus
urget partes duas ligni fiſſi ſunt ad vim mallei in cuneum, ut
progreſſus
cunei ſecundum determinationem vis a malleo in ipſum
impreſſæ
, ad velocitatem qua partes ligni cedunt cuneo, ſecundum
lineas
faciebus cunei perpendiculares.
Et par eſt ratio Machina­
rum
omnium.

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