Marci of Kronland, Johannes Marcus
,
De proportione motus figurarum recti linearum et circuli quadratura ex motu
,
1648
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habebit rationem duplicatam ſuæ longitudinis ad datum tri
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anguli latus, quod gravitati, VG unius libræ, ſit æquale. </
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>Vt
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ſi promoviſſe dicatur eo lapſu prius quidem ad digitos 4. </
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de ad paſſus 3: habebit impulſus hoc intervallo collectus ad
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illum rationem, quam 1804. ad 1. </
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>At verò ſi pila deſcen
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dat ad totidem paſſus; minùs offendit, quàm ſi eadem ex illâ
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diſtantiâ proijciatur. </
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<
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>Eſt autem impulſus ab arcu, ſeu fundâ
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his muitò vehementior: ut nihil dicam de Cylindro bellico. </
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<
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>Deinde dico ab huius modi Iobolis nonignorari hanc motûs
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curvitatem: unde etiam rationem habent diſtantiæ. aliter e
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nim ex magno, aliter ex parvo intervallo ictum dirigunt:
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neq;
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ſolùm intervalli, ſed etiam ictûs vehementiæ modum expen
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dunt. </
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Dices quamobrem alij alijs feticiùs ſcopum aſſequuntur: tamctſi ijs
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dem inſtrumentis uſi, eadem〈que〉 collineatione factâ.
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<
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>Reſpondeo id ex diverſo pupillæ ſitu provenire. accidit e
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nim his, quemadmodum ſi quis digito preſſam loco moveat:
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tum ſiquidem alius rei,
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atq;
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imaginis locus. unde cùm ictum
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dirigant ad locum viſum, quid mirum à loco verò aberrare. </
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<
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>Ita quidem in motu proiectorum; quæ lineam ſequuntur ex
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angulo recto, aut recto maiore. </
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>Quòd ſi cum motu vertica
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li angulum
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contineãt
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minorem recto; quia tum mobile fit pro
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pius centro, videbitur hic gravitas capere augmentum eo la
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pſu: quod ſimilis videatur motui inclinato; in quo velocitas
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continnò augetur, Dico nihilominus eandem eſſe
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vtro-biq;
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bique</
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rationem. </
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<
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>Alia autem eſt ratio motûs inclinati. propterea
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quòd pars gravitatis maneat extra hypomochlium: ac proin
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de impulſum producat ſibi æqualem: qui in deſcenſu </
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