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Christiani Hvgenii ... Horologivm oscillatorivm : sive, De motv pendvlorvm ad horologia aptato demonstrationes geometricæ (1673)
Huygens, Christiaan, 1629-1695 · Parisiis : F. Muguet · leaf 129
linea retia 3 erit Jumma quadratorum ab om- t 1 © n i s« nibus Jemper eidem plano aqualis. Sint data punda abcd: centrumque gravitatis eorum , five magnitudinum aequalium ab ipfis fufpenfarum, fit e •, & centro e defcribatur circulus quilibet p/, in cujus circumferentia fumpto pundo aliquo, ut p ,… … Ducantur enim redae gh3gk,angulum redum conftituentes, & quarum unicuique omnia data punda fint pofita ad eandem partem. Etafingulis in utramque harum perpendiculares agantur al,ak; b m, b o; c N3c P; dh, d c^A centro autem gravitatis e , & a pundo p, in alterutram duarum, g h vel g k ,…Clocks and watches · Pendulum
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