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

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8383I PROPOSITIO.
Dati cujuſcunque corporis planum diametrale, diame-
trum perpendicularem &
centrum pragmaticè invenire.
1 Exemplum.
D*ATVM*. A B corpus figurâ qualicunque.
Q*VAESITVM*. Planum diametrale, diametrum perpendicularem, cen-
trum denique mechanicè anquirere.
CONSTRVCTIO.
Solidum datum ſuſpendatur è fune CD, acta deinde recta EF per ſum-
mum punctum C, ab utroque ejus termino perpendiculares E G, F H è plum-
bo &
filo ſuſpendantur, quæ corpus ipſum A B proximè ſtringant, planum
125[Figure 125] inter parallelas E G, F H comprehenſum, ſiſolidum ſecare intelligatur, dati
corporis diametrale planum erit, verùm ut ipſæ lineæ in ſolidi ſuperficie inſcri-
bantur, fila tenſa &
creta infecta impreſſionem faciant uti à materiariis fabris
fieri confuevit, illæ igitur ſunto I K, L M quæ connexæ optatum LIK M pla-
num continuebunt.
Sed ad diametri perpendicularis inventionem corpus ex eadem recta C D
dependens pauxillum convertito &
ſimile aliud diametrale planum delineato,
à quo prius infra in N ſupra autem in D interſecetur, recta D N, ipſorum com-
munis fectio, erit perpendicularis gravitatis diameter.
Denique ad centri inve-
ſtigationem corpus tranſverſim alicunde ex O ſuſpenſum exhibeat alteram
perpendicularem diametrum O P, quæ priorem incîdatin Q, idipſum gra-
vitatis erit centrum.

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