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

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1ex centro E ducatur ſemidiameter figuræ motûs EF: ſitque in­
veniendum planum, in quo circulus P æquali celeritate feratur.

In lineâ verticali HI centro O deſcribatur circulus HMN: cu­
ius diameter HN ſit æqualis ſemidiametro figuræ motûs EF:
& ex puncto H ducatur chorda HM æqualis EG ſegmento in­
ter centrum figuræ & hypomochlium.
Dico inuentum eſſe

planum HML, in quo idem ſit circuli, qui trianguli in plano
HK motus.
Nam ut EF ad EG, ita totus impulſus, ſeu verti­
caliter mouens ad impulſum in HK per 8. theor: & per po­
ſitionem 4-motus trianguli in HI ad motum eiuſdem in HK.

Et ut HN ad HM, ita motus circuli in HI ad motum eiuſdem in
HL per prop, 13 de pro por: motûs.
At verò eandem ratio­
nem habet HN ad HM, quam EF ad EG per conſtructionem.

Igitur motus circuli in HL eſt æqualis motui trianguli in HK.
motum ergo trianguli iſogoni ijſdem loci interuallis terminaui­
mus, quod erat faciendam.

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