Stevin, Simon, Mathematicorum hypomnematum... : T. 4: De Statica : cum appendice et additamentis, 1605

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881 L*IBER* S*TATICÆ*
10 DEFINITIO.
Et Anſæ punctum in jugo fixum. Punctum firmum.
DECLARATIO.
Vt E, in 8 definitione, punctum eſt ſtabile.
11 DEFINITIO.
Dicta autem pondera ſitu æquilibria dicimus.
DECLARATIO.
Vt A & B, in tertiæ definitionis figurâ, ſive ambo ſuo pondere ſint æqui-
pondia, ſive inæquipondia, ex ſitu æquilibria vocamus, quòd poſitu æque-
ponderantia ſunt, A enim ex jugo dependens tantum poteſt ob ſitum, quan-
tum B, &
viciſſim B quantum A.
Iſta ex ſitu æquilibritas neceſſariò notanda, & , quia diverſæ ſunt, ab æqui-
ponderitate dirimenda.
Nam, exempli causâ, pondus ex minore radio in ſta-
tera dependens nonnunquam decuplum eſt ad alterum, æqualem tamen gra-
vitatem præ ſe ferunt, ſed ſpecie tantum non propriè, &
tantummodo propter
ſitum.
12 DEFINITIO.
Pondus elevans dicitur quicquid eſt cauſa ponderis in
altitudinem elati.
DECLARATIO.
6[Figure 6]
Columna A pondus eſto,
B C linea ex qua ſuſpen-
ſa tenetur, /oriſmatis pun-
ctum in quo quieſcat D, E
vero pondus, corpus A eo-
dem tenens ſitu.
Quapro-
pter E primæ ſecundæq́ue
figuræ pondus elevans, iſto
enim pondere corpus ele-
vatur, aut elevatum eodem
ſitu tenet.
E vero tertiæ &
quartæ figuræ pondus de-
mittens, quod corpus la-
tere B affixum deſcendere
faciat, vel illo ſitu demiſſum
detineat.
13 DEFINITIO.
Lineam à gravitate ſublatâ verſus pondus attollens,

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