Marci of Kronland, Johannes Marcus, De proportione motus figurarum recti linearum et circuli quadratura ex motu, 1648

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1
æquale pondus lapſu verticali ex A.
Propterea quòd tangenti
BV nulla in circulo reſpondet ex B ducta chorda parallela.

Motus igitur ex C, per arcum CEB eſt æqualis duratione mo­
tui per chordam AB, hoc eſt per theor 15. motui per chordam
CB.
7[Figure 7]
THEOREMA. VI.
Pendulum ex quolihet puncto circuli æquali tempore recur­
rit in ſuam ſtationem,
Quia enim lapſus per arcum CEB eſt æqualis lapſui per
chordam CB & lapſus per arcum ESB æquatur lapſui per chor­
dam EB per 5 theorema huius.
Sunt autem lapſus per chordam
CB & EB inter ſe æquales duratione per prop: 15 erit quoque la­
pſus per arcum CEB æqualis duratione lapſui per arcum ESB.

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