Valerio, Luca, De centro gravitatis solidorum, 1604

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1ad T, ita fiat T ad ZY, cuius Zω, tribus GE, EH, V
ſimul ſit æqualis.
Dico ABCD portio­
nem ad cylindrum SO eſse vt ωΥ ad ΥZ.
Abſciſsa enim GK ipſi EG æquali, cylin­
drus PN circa axim GH, & conus KEN
conſtituantur vt in præcedenti.
planum igi­
tur abſcindens portionem facit fruſtum coni
KEN, quod ſit KLMN, cuius minor ba­
ſis circulus, cui diameter LM; maior autem
cui diameter KN.
Et vt eſt GE ad EF, hoc
eſt GK ad SH, ita ſit EF, vel SH, ad I.
vt igitur in præcedenti, oſtenderemus cylin­
drum SO ad cylindrum PN eſse vt I ad
GK ſiue ad EG.
Quoniam igitur ſunt ter
næ deinceps proportionales GE, EF, I, &
X, T, ZY, eſtque vt FE ad EG ita T ad X;
erit vt I ad EG, hoc eſt vt cylindrus SO ad
PN cylindrum ita ZY ad X.
Et quoniam eſt vt
GE ad EH, ita EH ad V: hoc eſt, vt GK ad
LH. ita LH ad V: & ponitur X tripla ipſius
83[Figure 83]
EG, hoc eſt ipſius GK, vt autem eſt triplaipſius GK ad
tres deinceps proportionales GK, LH, V, ita eſt cylin­
drus PN ad fruſtum LKNM; erit vt X ad tres GE, EH,
V ſimul hoc eſt ad lineam ωZ, ita cylindrus PN ad fru-

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