Bernoulli, Daniel
,
Hydrodynamica, sive De viribus et motibus fluidorum commentarii
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241 - 270
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HYDRODYNAMICÆ
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te reſpectiva 12 pedum: </
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<
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xml:space
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">vim iſtius venti æſtimo = ponderi {9 x 1600/850} ped. </
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<
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</
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<
s
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xml:space
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">aquæ, ſeu fere 17. </
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</
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<
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<
s
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xml:space
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">Hæc ſi ita ſint, ſequitur navem ab elevatione aquarum 260. </
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<
s
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xml:space
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">operario-
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rum poſſe ea velocitate propelli, qua ſingulis minutis ſecundis ſpatium per-
<
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currat 6 {1/2}. </
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<
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<
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</
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<
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<
s
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xml:space
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">Æſtimatio non admodum diverſa ſequitur ex iis, quæ D. </
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<
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habet in Comm. </
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<
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<
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<
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<
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<
s
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"
xml:space
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">Ut vero recte
<
lb
/>
ad inſtitutum noſtrum applicari poſſint, notandum erit in remigatione, vim
<
lb
/>
triremem propellentem non eſſe æſtimandam ex preſſione remigum in remos,
<
lb
/>
ſed ex preſſione, quam remorum extremitates aquis ſubmerſæ contra aquas
<
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/>
exerunt. </
s
>
<
s
xml:id
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xml:space
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">Ut hanc proxime definiamus, hæc prius erunt obſervanda. </
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>
<
s
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xml:space
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">Remiges
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fuere adhibiti 260. </
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<
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xml:space
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">totis viribus remigantes: </
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<
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">ſingulis minutis primis remorum
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impulſus (gallicè palades) facti ſunt 24: </
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<
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">integra remorum agitatio tribus abſol-
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vitur motibus, quos ejuſdem durationis ponam, eorumque unus ſolus
<
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triremem promovet: </
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<
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xml:space
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">hoc modo triremis velocitate fuit provecta, qua
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ſingulis minutis ſecundis ſpatium 7 {1/5}. </
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<
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xml:id
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<
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xml:space
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">abſolvebat, pars remi intra navem
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fuit 6. </
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<
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<
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<
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<
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">ſuperficies autem (gallicè les pales)
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omnium remorum, quæ contra aquas impelluntur, in unam collectæ D.
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</
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<
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<
s
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xml:space
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">notavit porro extremitatem inter-
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nam remi ſingulis agitationibus ſpatium deſcribere ſex pedum: </
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<
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xml:space
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">& </
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<
s
xml:id
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">quia quævis
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agitatio tempore {60/24}. </
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<
s
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xml:space
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">unius minuti ſecundi abſolvitur ſimulque ex tribus con-
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ſtat motibus, quos pono tautochronos, apparet quamvis remi retractionem
<
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fieri tempore {20/24}. </
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<
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<
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">unius minuti ſecundi & </
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<
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xml:space
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">hoc tempore extremitas remi
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interna abſolvit ſpatium 6. </
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<
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<
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">Porro ob longitudinem ſuperficiei remo-
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rum, quæ contra aquas impellitur, non tota eſt ad diſtantiam 12. </
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<
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cenſenda: </
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<
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<
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tra navem promineret 10. </
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<
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<
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pedes tempore {5/6} unius minuti ſecundi: </
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<
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a triremis velocitatem
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habet, qua eodem tempore ſex pedes abſolvit, cenſendum eſt, remorum ex-
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tremitates contra aquam impelli velocitate reſpectiva, qua tempore {5/6}. </
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<
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ſec. </
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<
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<
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">igitur vis triremem propellens eſt æqualis vi, quam
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aqua contra ſuperficiem 130. </
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<
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incurreret, qua tempore {5/6} min. </
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<
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<
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<
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