Gravesande, Willem Jacob 's
,
Physices elementa mathematica, experimentis confirmata sive introductio ad philosophiam Newtonianam; Tom. 1
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PHYSICES ELEMENTA
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lineis jungantur puncta D, d, & </
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DE d erunt ſimilia, ut notum eſt; </
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<
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net, ſi ipſi arcus B b, D d fuerint minimi, ita ut pro lineis
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rectis haberi poſſint.</
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xml:space
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cus obtinet, id eſt ED eſt pars tertia ipſius E b, aut EB;
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</
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<
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igitur MD in duas partes æquales in E; </
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tertia ipſius EB.</
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<
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& </
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M n; </
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cemus quæ reſpectu fig. </
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B p valet 3 M n, cujus quadratum eſt 9 M n
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, habe-
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mus</
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, BL
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:: 8 R
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, J
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-R
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cus BN, cui æqualis HG; </
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nis, æquales angulis incidentiæ , æquales ſunt DF & </
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<
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quorum ſemi differentia eſt menſura anguli HPB, ab ex-
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eunte radio cum incidente formato; </
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caſu omnium ſimilium eſt minimus, & </
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refrangibilitâte diverſus. </
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plicem reflectionem efficaces variorum colorum, poſitis inci-
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dentibus parallelis, ſeparantur.</
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<
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2.</
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.
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fig. 4.</
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tur, ſitus phialæ tantum paululum mutatur, ut, poſt duas in
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phialâ reflexiones, radii ad oculum aut chartam verſus N per-
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veniant.</
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<
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phænomenon guttæ aqueæ in aëre ſuſpenſæ requiruntur; </
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ſpectator, adverſo Sole inter hunc & </
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poſt guttas nubes detur obſcura, ut magis ſenſibiles ſint </
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