Full text: Archimedes: Archimedis De iis qvae vehvntvr in aqva libri dvo

16. COMMENTARIVS.

AT ucro ea, quæ feruntur deorſum, ſecundum perpendicula-
rem, quæ per centrum grauit atis ipſorum ducitur, ſimiliter ferri,
uel tanquam notum, uel ut ab alijs poſitum prætermiſit.

17. PROPOSITIO VIII.

SI aliqua magnitudo ſolida leuior humido,
quæ figuram portionis ſphæræ habeat, in humi-
dum demittatur, ita vt baſis portionis non tan-
gat humidum: figura inſidebit recta, ita vt axis
portionis ſit ſecundum perpendicularem. Et ſi
ab aliquo inclinetur figura, vt baſis portionis hu-
midum cõtingat; non manebit inclinata ſi demit
tatur, ſed recta reſtituetur.

17.1.

A
B

[INTELLIGATVR quædam magnitudo, qualis
dicta eſt, in humidum demiſſa: & ducatur planum per axẽ
portionis, & per terræ
centrum, ut ſit ſuperfi-
ciei humidi ſectio circũ
ferentia a b c d: & figu-
ræ ſectio e f h circunfe-
rentia: ſit autem e h
recta linea; & f t axis
portionis. Si igitur in-
clinetur figura, ita ut a-
xis portionis f t non ſit
ſecundum perpendicu-
larem. demonſtrandum eſt, non manere ipſam figu-
ram; ſed in rectum reſtitui. Itaque centrum ſphæræ eſt

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