Fabri, Honoré
,
Tractatus physicus de motu locali
,
1646
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Definitio
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5.
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Linea reflexionis eſt illa linea motus, per quam mobile poſt reflexionem re
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cedit à plano inclinato
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; hinc vides punctum reflexionis eſſe terminum ad
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quem illius lineæ, & terminum à quo huius. </
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Definitio
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6.
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Angulus incidentiæ eſt, quem facit cum plano reflectente linea inci
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dentiæ.
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Definitio
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7.
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Angulus reflexionis eſt, quem facit linea reflexionis cum eodem plano.
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Definitio
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8.
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Cathetus eſt linea perpendiculariter cadens in planum reflectens ducta ab
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aliquo puncto linea incidentia
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; </
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">& tunc dicitur Cathetus incidentiæ; </
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ab aliquo lineæ reflexionis, & tunc dicitur Cathetus reflexionis; hæc
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omnia ſunt facilia, quæ in gratiam Tyronum breuiter in figura
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propono. </
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">ſit D punctum reflexionis; ſit AD
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linea incidentiæ, DH linea reflexionis, AB Cathetus incidentiæ, HF
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Cathetus reflexionis, ADB angulus incidentiæ, EDF oppoſitus,
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HDF angulus reflexionis, CDB oppoſitus, ADH angulus aperturæ
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vel pyramidis reflexionis, EDC oppoſitus, ADE angulus ſupplementi
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anguli incidentiæ, HDG angulus complementi anguli reflexionis, re
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ctangulum BH ſuperficies reflexionis, BF ſectio plani reflectentis, &
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prædictæ ſuperficiei. </
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Hypotheſis
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1.
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Aliquod corpus in aliud cum impetu impaction reflectitur,
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hæc hypothe
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ſis certa eſt. </
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Hypotheſis
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2.
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Corpus reflexum in aliud impactum aliquando illud mouet
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; ſic pila ab
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aliquo corpore reflexa in aliam incidens mouet illam. </
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Hypotheſis
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3.
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Quo motus directus, ſcilicet qui ſis per lineam incidentia, eſt maior, maior
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eſt quoque motus reflexus
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; ſi enim maiore vi pila appellitur in parietem
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maiore vi etiam retorquctur. </
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Axioma
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1.
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Idem impetus ad plures lineas determinari pereſt ſeorſum
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; </
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<
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certum eſt; probatum eſt in libro 1. Th.113.114. &c. </
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<
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plures ſimul lineas habere non poteſt per Th.115.l.1. </
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Axioma
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2.
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Vbi eſt effectus, ibi eſt cauſa, effectus inquam formalis,
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v. g. vbi eſt album,
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ibi eſt id, quod exigit motum, ſeu præſtat illum motum in mobili; </
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