Archimedes, Archimedis De iis qvae vehvntvr in aqva libri dvo

Table of contents

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[11. PROPOSITIO IIII.]
[12. PROPOSITIO V.]
[13. PROPOSITIO VI.]
[14. PROPOSITIO VII.]
[15. POSITIO II.]
[16. COMMENTARIVS.]
[17. PROPOSITIO VIII.]
[18. COMMENTARIVS.]
[19. PROPOSITIO IX.]
[20. COMMENTARIVS.]
[21. ARCHIMEDIS DE IIS QVAE VEHVNTVR IN AQVA LIBER SECVNDVS. CVM COMMENTARIIS FEDERICI COMMANDINI VRBINATIS. PROPOSITIO I.]
[22. PROPOSITIO II.]
[23. COMMENTARIVS.]
[24. PROPOSITIO III.]
[25. PROPOSITIO IIII.]
[26. COMMENTARIVS.]
[27. PROPOSITIO V.]
[28. COMMENTARIVS.]
[29. PROPOSITIO VI.]
[30. COMMENTARIVS.]
[31. LEMMAI.]
[32. LEMMA II.]
[33. LEMMA III.]
[34. LEMMA IIII.]
[35. PROPOSITIO VII.]
[36. PROPOSITIO VIII.]
[37. COMMENTARIVS.]
[38. PROPOSITIO IX.]
[39. COMMENTARIVS.]
[40. PROPOSITIO X.]
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FED. COMMANDINI
teſt in portione, quæ recta linea & obtuſianguli coni ſe-
ctione, ſeu hyperbola continetur.

THE OREMA IIII. PROPOSITIO IIII.

In circulo & ellipſiidem eſt figuræ & graui-
tatis centrum.
SIT circulus, uel ellipſis, cuius centrum a. Dico a gra-
uitatis quoque centrum eſſe.
Si enim fieri poteſt, ſit b cen-
trum grauitatis:
& iuncta a b extra figuram in c produca
tur:
quam uero proportionem habetlinea c a ad a b, ha-
beat circulus a ad alium circulum, in quo d;
uel ellipſis ad
aliam ellipſim:
& in circulo, uel ellipſi ſigura rectilinea pla-
ne deſcribatur adeo, ut tandem relinquantur portiones
quædam minores circulo, uel ellipſid;
quæ figura ſit e f g
h _k_ l m n.
Illud uero in circulo fieri poſſe ex duodecimo
elementorum libro, propoſitione ſecunda manifeſte con-
ſtat;
at in ellipſi nos demonſtra-
Figure: /permanent/library/4E7V2WGH/figures/0122-01 not scanned
[Figure 78]
uinius in commentariis in quin-
tam propoſitionem Archimedis
de conoidibus, &
ſphæroidibus.
erit igitur a centrum grauitatis
ipſius figuræ, quod proxime oſtē
dimus.
Itaque quoniam circulus
a ad circulum d;
uel ellipſis a ad
ellipſim d eandem proportionē
habet, quam linea c a ad a b:

portiones uero ſunt minores cir
8. quinti.culo uel ellipſi d:
habebit circu-
lus, uel ellipſis ad portiones ma-
iorem proportionem, quàm c a
19. quinti
apud Cã
panum.
ad a b:
& diuidendo figura recti-
linea e f g h _k_ l m n ad portiones

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