Marci of Kronland, Johannes Marcus, De proportione motus, seu regula sphygmica ad celeritatem et tarditatem pulsuum, 1639

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1go po ſunt in peripherià circuli, cujus centrum a, à quo
æqualiter abſiſtunt illæ lineæ. Simili modo oſtende­
mus puncta n.m.l eſſe in peripheriá ejuſdem circuli, pro­
19[Figure 19]
pterea quód lineæ an. am. al, baſes nimirum æqualium
triangulorum, ſunt æquales lineæ ab. Excurſus ergo
grauium à termino motus in circulum terminantur &c.
Propoſitio XII.
Motus per arcus ejuſdem circuli rationem habet, quam ſinus an
guli dupli illorum angulorum, qui complementa ſunt inclinationis
cordarum.
ASſumantur arcus bdi. bdc, & ducantur cordæ bi. bc,
eruntque; anguli abi. abc anguli inclinationis

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