Fabri, Honoré
,
Tractatus physicus de motu locali
,
1646
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rè tempore peraguntur; </
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<
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">ſunt enim vibrationes eiuſdem funependuli; </
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quippe licèt minor vibratio minore tempore fiat; </
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<
s
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">illud tamen ſenſu diſ
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cerni non poteſt, niſi in ſerie multarum vibrationum; </
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<
s
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">atqui GR perfici
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tur æquali tempore, ſiue pendulum deſcendat ex V; ſiue ex Y; </
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<
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enim æqualis impetus vtroque modo; </
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<
s
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">ſed aſcenſus GR fieret æquali
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tempore cum deſcenſu YG; </
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<
s
id
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">hic verò breuiore, quàm VG, vt patet; ſunt
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enim numeri vibrationum, vt radices longitudinum. </
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<
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">Obſeruabis denique poſſe funependulum, PG ſolidum demitti ex A,
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ſi tantillùm inclinctur; fed de hoc funependulorum genere agemus
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infrà. </
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Theorema
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29.
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Funependulum in fine aſcenſus non quieſcit vno inſtanti
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; </
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<
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">quia numquam
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ad perfectam æqualitatem peruenitur; quod eodem modo probatur,
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quo ſuprà l. 3. eſt enim par ratio. </
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Theorema
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30.
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Figura penduli multum facit ad motum vibrationis
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: </
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<
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ferè aptiſſima eſt præter Conchoidem, & eam, quæ conſtaret ex duobus
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conis in communi baſi coniunctis, vel in gemina pyramide; ratio conſtat
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ex cis, quæ diximus de motu naturali. </
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Theorema
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31.
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Funis multùm etiam facit
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; </
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<
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">omnium optimus eſt tenuiſſimus, qui ſci
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licet faciliùs aëra ſecat; </
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<
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id
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">nec enim dubium eſt, quin huic diuiſioni reſiſtat
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aër, cuius reſiſtentiæ analogiam videmus in aqua, quam funis oblongus
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non niſi cum ſenſibili reſiſtentia diuidit, vt videre eſt in iis funibus, qui
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bus ab equis naues trahuntur; </
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<
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<
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vnum præſertim obſeruandum eſt, ſcilicet ne præ nimia tenuitate maio
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ris fortè vi ponderis vlterius ducatur, vel dilatetur; </
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<
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">vtrumque enim mo
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tum vibrationis retardat: </
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<
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">immò pendulum ipſum non deſcriberet ſemi
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circulum; an verò ſemiellypſim vt volunt aliqui, definiemus ſuo loco,
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cum de lineis motus. </
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Theorema
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32.
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Pondus funependuli multùm facit ad vibrationis motum
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; </
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<
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">ſi enim granu
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lum plumbeum appendatur, vix ſuperabit reſiſtentiam funis, qui vt vi
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bretur, optimè tenſus eſſe debet; atqui notabili pondere tendi tantùm
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poteſt. </
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Theorema
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33.
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Materia funependuli multùm etiam facit ad vibrationis motum ſuppoſita
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ſcilicet eadem figura
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; </
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<
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">quippe tam leuis eſſe poſſet materia, vt nec aëris
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vim nec funis reſiſtentiam ſuperaret: </
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>
<
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">hinc globus ſubereus vel è ſambu
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cea medulla conſtans, tardiùs deſcendit, quàm plumbeus; </
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<
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">habes apud
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Merſennum has proportiones; </
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<
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">globus plumbeus pendulus fune pedum
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3. 1/2 è ſummo quadrantis arcu demiſſus aſcendit per arcum oppoſitum </
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