Gravesande, Willem Jacob 's
,
Physices elementa mathematica, experimentis confirmata sive introductio ad philosophiam Newtonianam; Tom. 1
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MATHEMATICA LIB. III. CAP. XIX.
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do: </
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<
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">ita, ut hæc longitudo ſola conſideranda ſit in determi-
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nandis colorum limitibus, in ipſâ imagine, hi in hac figurâ
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litteris a, b, c, d, e, f, g, h, notantur, & </
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<
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cuique colori adſcriptus ſpatium ab hoc in imagine occupa-
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tum deſignat, diviſâ totâ imaginis longitudine in partes 360.</
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<
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<
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xml:space
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">Si latitudo imaginis Solis oblonga minuatur, magis in i-
<
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">862.</
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magine colores heterogenei ſeparantur, quia in ſingulis pun-
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ctis minori numero confunduntur imagines peculiares, ex
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radiis variarum refrangibilitatum parum inter ſe differentium.</
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<
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<
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xml:space
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">Color cujuſcunque radii, ut & </
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<
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xml:space
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">hujus refrangibilitas, nul-
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lis refractionibus, neque reflexionibus, aut per mixtionibus
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quibuſcunque mutatur.</
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<
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<
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">De refractione & </
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">reflectione in hoc capite, de permixtio-
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ne in ſequenti, agam.</
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<
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">864.</
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præcedentis probatur; </
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<
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">quod & </
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<
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teſt; </
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<
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xml:space
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">hæc eadem experimento ſequenti clariùs evincuntur.
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<
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">de ſequentibus etiam dicen-
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dum eſt, experimenta inſtituenda eſſe cum priſmatibus ex
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vitro puro venulis immune, his enim irregulariter lumen in
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priſmate movetur & </
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<
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1.</
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<
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<
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xml:space
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fig. 2.</
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tuitur experimentum cum radio ſolari per foramen intrante,
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cujus diameter eſt ſemi pollicis; </
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<
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">ſuſtentaculum autem S
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priſmatis tale eſt, ut inter latera moveatur tabella t, quæ in
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hoc experimento uſu venit, in hac datur foramen F diame-
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tri octavæ partis unius pollicis, per hoc tranſmittitur lumen
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à priſmate refractum, quo radii in oblongâ imagine melius
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inter ſe ſeparantur, radiis magnâ parte interceptis; </
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<
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hæc oblonga RV, ad diſtantiam decem aut duodecim pe-
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dum à priſmate, cadit in tabellam t, ſuſtentaculi ſimilis
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priori, in quâ tabellâ etiam exiguum, ut in primâ, datur
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foramen F; </
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<
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dunt priſma, huic ſuſtentaculo impoſitum, & </
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eodem modo ac per primum; </
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do primum priſma, adſcendit aut deſcendit imago RV, </
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