F. Marini Mersenni ... Cogitata physico mathematica : in quibus tam naturae quàm artis effectus admirandi certissimis demonstrationibus explicantur (1644)
Y "07. AINDLTSTLCA. a5 Adde re&am ex D; vertice parabole B L D , ductam omnes TS J las, qua sambitufuo concludit, ita fecarc videri , vcà punáis , in qui- … busfecantut , rez perpendiculariter axi cuiuflibet ducta, illius ctiam focum oftendat , vt conftat ex B D recta, per H , verticem parabola AH D tranfeuntem, reca fiquidem ex pun&oD in axem H G. per- pendiculariter aa , focum in.G effe decet. est | Denique quemadmodum iactus femirecti longitudo À D…
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