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

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1& principium motus, ideſt ab ipſi bg, & ac ipſi cb, & ad
ipſi di, & ac ipſi ek, & af ipſi fl ſit æqualis, dico puncta
aghikl cadere in latus al trianguli alf. Quòd ſi enim
punctum i, u:g: dicatur non in latus al, ſed extra illud ca­
6[Figure 6]
dere in r, ducatur linea ar, eritque; angulus rad major
angulo iad. quia ergo latus dr lateri da eſt æquale, & an
gulus adr rectus, erunt anguli dar. dra inter ſe æqua­
les, ac proinde ſemiſſes anguli recti.
Similiter quia
latus fl eſt æquale lateri fa, & angulus afl re­
ctus, erunt anguli fal. fla inter ſe æquales; igitur & an­
gulus laf angulo rad erit æqualis pars toti, quod eſt ab­
ſurdum: non ergo punctum i extra latus al cadit. Simi­
li modo oſtendemus non cadere intra illud latus: ca­
det ergò neceſſarió in ipſum latus.
Si ergo punctum
æqualiter moueatur in plano motu ſimul recto & late­
rali in eadem proportione &c.

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