Bernoulli, Daniel
,
Hydrodynamica, sive De viribus et motibus fluidorum commentarii
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SECTIO DECIMA.
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<
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xml:space
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">Nihil dico de modis hujusmodi thermometra ſenſibiliora reddendi; </
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<
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rum quisque facile excogitabit plures, qui volet. </
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<
s
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xml:space
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">Curetur autem, ut alti-
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tudo B E non ſit infra 4 pedes, imo ut major ſit, ſi etiam aliorum fluidorum
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bullientium gradus caloris, qui ſæpe major eſt quam in aqua, experiri ani-
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mus ſit. </
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<
s
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">Si minora hujusmodi thermometra deſiderentur, poterunt ea ita
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fieri, ut tempore ſigillationis in m ampulla vitrea A F igni lampadis appona-
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tur ad rarefaciendum aërem in illa contentum, tuncque protinus ſigillatio
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fiat, & </
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<
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">ne ſigillationi mora injiciatur, poterit prius ampulla vitrea in tubu-
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lum capillarem duci, qui vel leviter flammæ admotus illico colliqueſcat. </
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<
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xml:space
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">Hoc
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modo thermometra obtinui non ultra quatuor aut ſex pollices longa, ſed
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parvæ virtutis. </
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<
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">Cæterum multum refert, ut ſpatium E D ſit ab omni aëre,
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quantum fieri poteſt, vacuum, neque de iſto vacuo ſatis certi erimus cum
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viderimus in ſitu inſtrumenti horizontali mercurium extremitatem Eattinge-
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re, quia fieri poteſt, ut aër, qui antea in ſpatio E D fuit, ſeſe in poros
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mercurii recipiat, rurſusque priſtinum ſpatium occupet deſcendente mercu-
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rio: </
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<
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xml:space
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">tutius erit examen admovendo partem D E flammæ: </
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<
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">ſi enim à calore
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flammæ ſuperficies D locum non mutet, indicium erit certum vacuum eſſe ab
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aëre ſpatium E D.</
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<
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">§. </
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">10. </
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">In præcedente paragrapho conſideravimus ſpatium A m F ab
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aëre occupatum veluti infinitum ratione ſpatii D G aut D E: </
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<
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xml:space
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">Quod ſi vero
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fuerit tantum octuplo vel decuplo majus, nondum licebit illud ſine notabi-
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li errore tanquam infinitum conſiderare: </
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<
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xml:space
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">atque hinc conjicio ortum eſſe
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errorem aliquem in definiendo elatere aëris mediocriter calidi in experimen-
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tis Amontonianis.</
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<
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xml:space
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">Ut igitur accuratiſſime fiat experimentum, ita procedendum erit: </
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<
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rit ſuperficies mercurii inferior in A F ducaturque horizontatis in A L: </
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de pro caloris gradu qualicunque definiendo inclinetur inſtrumentum, donec
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ſuperficies mercurii ſit in puncto g, (quod idem eſt in quo mercurius ſubſi-
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ſtebat à gradu caloris aquæ ferventis in ſitu thermometri verticali) tuncque
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capiatur menſura altitudinis verticalis gh, quæ erit ad altitudinem G B vere
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ut elater aëris, cujus calor definiendus eſt, ad elaterem aëris inſtar aquæ fer-
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ventis calidi. </
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<
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xml:space
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">Sic igitur calores erunt proprie in ratione altitudinem gh.
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</
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<
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">Priusquam hoc argumentum abrumpam, notaſſe conveniet (quandoquidem
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aliquibus fortaſſe videbitur primum, qui à nobis poſitus fuit, caloris gradum ab
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aqua bulliente deſumtum non ſemper nec ubique ſibi omnino conſtare) </
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