Gravesande, Willem Jacob 's
,
Physices elementa mathematica, experimentis confirmata sive introductio ad philosophiam Newtonianam; Tom. 1
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MATHEMATICA LIB. III. CAP. XVIII.
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illuminata rotunda, eo major, quo planum magis à foramine
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diſtat, quod oritur ex radiis à lateribus Solis provenientibus,
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cum illis, qui à centro ad foramen perveniunt angulum
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formantibus, & </
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xml:space
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">in foramine hos interſecantibus, ita ut in
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plano quaſi imago Solis detur.</
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<
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<
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xml:space
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">Si radii per priſma BB non tranſirent, & </
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<
s
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xml:space
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">ad diſtantiam
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tabulæ T in planum caderent, Solis imago haberet diametrum
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æqualem latitudini imaginis RV; </
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<
s
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xml:space
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">quæ latitudo refractione
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non mutatur; </
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<
s
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xml:space
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">quia radii, perpendiculariter ad axem, priſma
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intrant, & </
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xml:space
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">ad hoc, reſpectu latitudinis imaginis, non in-
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clinantur. </
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xml:space
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">Cum autem alio reſpectu oblonga ſit Solis imago,
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">853.</
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clarè inde ſequitur, non omnes radios æqualem paſſos re-
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fractionem; </
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<
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">radiis homogeneis rotundam, licèt refractis,
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dantibus Solis imaginem. </
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">Minimè refrangibiles radii pertin-
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gunt ad R, maximè refrangibiles ad V; </
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">& </
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">ſemicirculis in
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R & </
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">V terminatur tota imago RV; </
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">quia ex circularibus
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imaginibus tota conſtat: </
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">inter R & </
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<
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xml:space
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">V autem dantur imagi-
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nes circulares innumeræ, ex radiis refrangibilitatum inter-
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mediarum omnium poſſibilium; </
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xml:space
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">aliter ad latera non lineis
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rectis imago RV terminaretur.</
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<
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">In plurimis experimentis, per ſciſſuram aut foramen lu-
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men intromitti in locum obſcurum, vidimus, quod ad arbi-
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trium artificis reliquimus; </
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<
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">In plano ligneo, quo feneſtræ apertura obturatur, datur
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">854.</
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foramen quadratum, cujus latus eſt quatuor pollicum; </
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">TAB. XV.
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fig. 3.</
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cumdatur hoc tribus regulis ligneis AB, BC, CD, quæ
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retinent tabellam ligneam quadratam R, longitudinis & </
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titudinis ſex pollicum. </
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">variæ dantur
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variis experimentis inſervientes. </
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<
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">Quæ in experimento ſe-
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quenti adhibetur, à parte poſteriori in medio excavatur, ut
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contineat lentem convexam, objectivam Teleſcopii ſedecim
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aut viginti pedum; </
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<
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xml:space
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">in medio datur foramen rotundum f,
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cujus diameter ſemi pollicem ſuperat, per quod, tranſeun-
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do per vitrum, radii ſolares cubiculum intrant. </
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<
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riori parte quoque excavatur tabella Q, non tamen in medio;
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ripheriam perforatum in f, quod foramen æquale eſt </
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