Huygens, Christiaan, Christiani Hugenii opera varia; Bd. 1: Opera mechanica

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276174CHRISTIANI HUGENII11De centro
OSCILLA-
TIONIS.
+ vel - {1/4} p p + {1/2} a b p + a a p - {1/3} a a b - a a c/d}.
Ubi animadverten-
dum
, duas eſſe veras radices, ſi {1/2} a b p + c a p minus ſit
quam
{1/3} a a b + a a c;
hoc eſt, ſi longitudo p minor ſit quam
{{1/3} a b + a c/{1/2} b + c}, quæ antea inventa fuit longitudo penduli iſochro-
ni
, ſive diſtantia centri oſcillationis à ſuſpenſione, in pen-
dulo
compoſito ex virga A C &
pondere C.
Porro, ex æquatione ſuperiori, f = {1/2} p + vel -
{1/4} p p + {1/2} a b p + a c p - {1/3} a a b - a a c/d} habetur determinatio longitudi-
nis
p.
Patet enim, {1/4} p p + {1 a b p + a c p/2 d} non minus eſſe debere
quam
{1 a a b - a a c/3 d}.
Unde non debebit eſſe minor quam
{a/d} {4/3} b d + 4 c d + b b + 4 b c + 4 c c @ a b - 2 a c/d}.
Quod ſi p æquetur
huic
quantitati, hoc eſt, ſi {1/4} p p + {1 a b p + a c p/2 d} fuerit æquale
{1 a a b + a a c/3 d}, erit jam, in eadem ſuperiori æquatione, f = {1/2} p,
hoc
eſt, {a/2 d} {4/3} b d + 4 c d + b b + 4 b c + 4 c c -{a b - 2 a c/2 d}.
Quo
determinatur
diſtantia ponderis D à puncto A, ex qua ma-
xime
omnium acceleret motum penduli.

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