Huygens, Christiaan, Christiani Hugenii opera varia; Bd. 2: Opera geometrica. Opera astronomica. Varia de optica

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Ne autem Hugenii praxis geometrica minus peritis videa-
tur
noſtram ſuperaſſe, ex noſtra approximatione, ab Hu-
genio
rejecta, ſequentem praxin exhibebo.
In fig. Hugeniana ſit A C = A, A B C = B, ſitque
11TAB. XLIV.
fig
. 3.
A + B:
B : : 2B: C; eritque {8C + 8B - A/15} major, quam
arcus
A B C;
differentia autem, in ſemi-circumferen-
tia
minor erit quàm ipſius {1/3500}, in triente minor quam
ipſius
{1/40000}, &
in quadrante minor quam ipſius {1/300000}. Sed quo-
niam
præcedens approximatio major eſt quàm arcus, aliam
addamus
eodem minorem.
Sit A: B: :B: D; {12 C + 4 B - D/15}
minor
erit quam arcus A B C;
differentia autem in ſemi-cir-
cumferentia
minor erit quam ipſius {1/1000}, &
in quadrante
minor
quam ipſius {1/60000}, inter has approximationes ſit maxi-
ma
, penultima ſex continuè Arithmeticè proportionalium,
quæ
minor erit quàm arcus, differentia autem in ſemi-cir-
cumferentia
minor erit quam ejuſdem {1/23000}, &
in

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