Full text: Volumen primum. Opera mechanica (1)

95. DEFINITIO XIV.

De centro
OSOILLA-
TIONIS.

SI fuerint in eodem plano, figura quædam, & li-
nea recta quæ ipſam extrinſecus tangat; & per
ambitum figuræ alia recta, plano ejus perpendicu-
laris, circumferatur, ſuperficiemque quandam de-
ſcribat, quæ deinde ſecetur plano per dictam tan-
gentem ducto & ad dictæ figur æplanum inclinato; ſolidum comprehenſum à duobus planis iſtis, & par-
te ſuperficiei deſcriptæ, inter utrumque planum in-
tercepta, vocetur Cuneus ſuper figura illa, tan-
quam baſi, abſciſſus.

In ſchemate adjecto, eſt A B E C figura data; recta eam
tangens M D; quæ vero per ambitum ejus circumfertur,
E F; cuneus autem figura ſolida planis A B E C, M F G,
& parte ſuperficiei, à recta E F deſcriptæ, comprehenſa.

95.1.

TAB. XXI.
Fig. 3.

96. DEFINITIO XV.

D Iſtantia inter rectam, per quam cuneus abſciſ-
ſus eſt, & punctum baſeos, in quod perpen-
dicularis cadit à cunei centro gravitatis, dicatur
cunei Subcentrica.

Nempe in figura eadem, ſi K ſit centrum gra-
vitatis cunei, recta vero K I ad baſin ejus A B E C
perpendicularis ducta ſit, & rurſus I M perpen-
dicularis ad M D; erit I M, quam ſubcentri-
cam dicimus.

96.1.

TAB. XIX.
Fig. 3.

97. PROPOSITIO VII.

CUneus ſuper plana figura qualibet abſciſſus,
plano inclinato ad angulum ſemirectum, æqua-

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