Gravesande, Willem Jacob 's
,
Physices elementa mathematica, experimentis confirmata sive introductio ad philosophiam Newtonianam; Tom. 1
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MATHEMATICA. LIB. II. CAP. VII.
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e a (EA in fig. </
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<
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curius ex foramine exit, cum horizonte formatus menſura-
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tur ope quadrantis circuli diviſi q, juxta quem movetur in-
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dex f b, qui pondere ſuo ſemper in ſitu verticali retinetur.
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</
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<
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<
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<
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<
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xml:space
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parte duo dantur annuli, per quos tranſit manubrium EA
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fig. </
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<
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<
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">; quando manubrium hocce eſt in ſitu verticali, index
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cum diviſione anguli 45. </
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<
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<
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">directio motus mer-
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curii exeuntis in eo caſu angulum ſemi-rectum cum hori-
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zonte efficit.</
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<
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præſentantur: </
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<
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nigro colore tinctæ, quam mercurius in motu ſuo fere ra-
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dit; </
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<
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">in hac, quod hìc repræſentari non potuit, ſecundum di-
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cta in n. </
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<
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">, delineantur viæ a corpore, eadem celeritate,
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juxta directiones varios angulos cum horizonte ſormantes,
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percurſæ; </
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hac tabula deſcribitur.</
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<
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diverſis celeritatibus repræſentantur.</
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<
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<
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tere EFH, ita ut juxta longitudinem pyxidis moveri poſ-
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ſit.</
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tionem regulæ n m, & </
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<
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proſilit hydrargyrum, ad altitudinem delineationi in tabula
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congruentem diſponitur.</
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<
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4.</
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ptione dictum, inclinetur regula n m, donec altitudo, ad quam
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fig. 1.</
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proſilit mercurius, quando directione, quæ a verticali pau-
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lulum admodum divergit, in altum adſcendit, fere æquet
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diametrum ſemi-circuli in tabula G delineati. </
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altitudinem pyxis p conſtituatur, & </
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