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

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SEmicycloidis evolutione, à vertice cœpta, alia
ſemicyclois
deſcribitur evolutæ æqualis &
ſimi-
lis
, cujus baſis eſt in ea recta quæ cycloidem evolu-
tam
in vertice contingit.
Sit ſemicyclois A B C, cui ſuperimpoſita ſit alia ſimilis
55TAB. XVI.
Fig
. 1.
A E F, quemadmodum in propoſitione præcedenti.
Dico,
ſi
linea flexilis, circa ſemicycloidem A B C applicata, evol-
vatur
, incipiendo ab A, eam deſcribere extremitate ſua i-
pſam
ſemicycloidem A E F.
Quia enim ex puncto A egredi-
untur
ſemicycloides A B C, A E F, in unam partem in-
flexæ
, &
ambæ in eandem cavæ, ac præterea ita comparatæ,
ut
omnes tangentes ſemicycloidis A B C occurrant ſemicy-
cloidi
A E F ad angulos rectos, ſequitur hanc evolutione
illius
, à termino A incepta, deſcribi .
quod erat 66Propoſ. 4.
huj
.
ſtrandum.

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