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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ARCHIMEDIS
ſuperficiem recto, ſit portionis ſectio anzg; ſuperficiei
humidi ez:
a-
Figure: /permanent/library/4E7V2WGH/figures/0098-01 not scanned
[Figure 63]
xis portionis,
&
ſectionis dia-
meter b d:
ſece-
turq, b d in pũ-
ctis _K_r, ſicuti
prius;
& duca-
tur n l quidem
ipſi e z æquidi-
ſtans, quæ con-
tingat ſectionẽ
a n z g in n;
&
n t æquidiſtans
ipſi b d;
n s ue-
ro ad b d perpẽ
dicularis.
Itaq;
quoniam portio ad humidum in grauitate eam proportio
nem habet, quam quadratum, quod fit à linea ψ ad quadra
tum b d:
erit ψ ipſi n t æqualis: quod ſimiliter demonſtrabi
tur, ut ſuperius.
quare & n t eſt æqualis ipſi u i. portiones
igitur a u q, e n z inter ſe ſunt æquales.
Et cum in æquali-
bus, &
ſimilibus portionibus a u q l, a n z g ductæ ſint a q
e z, quæ æquales portiones auferunt;
illa quidem ab extre
mitate baſis;
hæc autem non ab extremitate: minorem fa-
ciet acutum angulum cum portionis diametro, quæ ab ex-
tremitate baſis ducitur.
At triangulorum n l s, u ω c angu
lus ad l angulo ad ω maior eſt.
ergo b s minor erit, quam
b c:
& ſ r maior, quàm c r: ideoq; n χ maior, quam u h; &
χ t minor, quàm h i.
Quoniam igitur u y dupla eſt ipſius
y i;
conſtat n χ maiorem eſſe, quàm duplã χ t. Sit n m dupla
ipſius m t.
perſpicuũ eſt ex iis, quæ dicta ſunt, non manere
portionẽ;
ſed in clinari, donec eius baſis contingat ſuperfi-
ciem humidi:
contingat autem in puncto uno, ut patet in fi

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