Gravesande, Willem Jacob 's
,
Physices elementa mathematica, experimentis confirmata sive introductio ad philosophiam Newtonianam; Tom. 1
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MATHEMATICA. LIB. II. CAP. XI.
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ſitis, adhibitoque tubo T, ſuperius memorato, cujus dia-
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fig. 1.2.</
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meter eſt hypotenuſa trianguli rectanguli iſoſceles, cujus
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ſingula latera ſunt duorum pollicum, globus æneus G, cujus
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diameter eſt ſemi poll.</
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<
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">, ſuſpenditur ad profunditatem, non
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intereſt quamcunque, ſex, octo, aut decem pollicum, in tu-
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bo, in cujus axe datur globus; </
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<
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xml:space
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">quia capillus equinus, cui
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cohæret, cum unco lancis E conjungitur.</
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<
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">tradita quæruntur actiones aquæ in
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globum, dum ſucceſſive, diverſis velocitatibus, aqua per tu-
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bum tranſit, quæ actiones valent reſiſtentias corporis, quan-
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do hoc, quieſcente aquâ, iisdem velocitatibus, in hac movetur.</
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<
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nandis, quartam partem grani valent; </
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ſquuntur.</
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Velocitates # Reſiſtentiæ
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1. # gr. {3/4}. 2. # gr. 1 {1/2}. 3. # gr. 3. 4. # gr. 4 {3/4}. 5. # gr. 7 {3/4}. 6. # gr. 10 {1/2}. 7. # gr. </
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<
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">In tribus primis velocitatibus deficiebant paululum a-
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ctiones a ponderibus notatis.</
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<
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">Experimenta hæc, adhibitâ admodum exactâ bilance, fue-
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re inſtituta, maximâ cum curâ, non tamen nullum omni-
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no errorem quantumvis exiguum dari aſlerere non auſim.</
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<
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">Fateor potius exiguos, quarta parte grani minores, vitari
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non potuiſſe, & </
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">non credo ab experimento recedi, quando
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tale quid ſuppletur, ubi regularis ſeries hoc poſtulat,</
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<
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">Errorem talem dari in prima actione, hîc determinatâ,
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quæ parum deficit a {3/4} gr.</
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