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# Title: Phoronomia, Sive De Viribus Et Motibus Corporum Solidorum Et Fluidorum Libri Duo (shelfmark Leibn. Marg. 182)
# Folio 177, page id 1066518432:0205
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DE VIRTDUS EF MOTIDUS CORPORUM. L 1B. II. X77
menta, duntaxat Baroscopii appellatione digna censuit, Barometri
nomen instrumento illi relerraturus, si quod unquam inreniri pol-
sit, quod aeris graritationes accuratisime monstret.
Inter alios defectus, quibus communia barolcopia laborant, Forte
praecipuus eAt, quod rariationes corum non laris sensibiles lunt:
hanc ob rem eximii Philolophi Hlugenius, De la Hlire, et Joh.
Bernoullius alias barolcopiorum constructiones excogitarunt, qui-
bus instrumentis minimae in aeris graritate mutationes sensibiliter
exprimerentur; hinc nata TunE gemina, quae rocantur barometra
Hlugenii dc Hlirei, quorum constructionibus explicandis nunc non
immorabor, cum Flugenii barometrum compolitum in Lphemeri-
dibus Callicis descriptum habeatur, et apud alios passim Autores de
rebus hisce agentes, ec Ccleb. Flireus barolcopii à se excositati
descriptionem etiam tradiderit in Actis Academix Regixe Paris.
Scient. 1708. d. 2T Martii. Scd quia barometrum, quod Acutis.
Geometra Joh. Bernoullius jam a multis retro annis excogitarit
publico nondum innotuit, nec a simplicitate lua contemnendum est,
ejus delcriptionem, ab Ingeniosis. Autore mihi benigne communi-
catam, hoc loco afterre non pigebit; constructio itaque barometri
Bernoulliani ita habet.
324. Sit ABC tubus e duobus ramis inxe qualium diametrorum com- Fi8. 76.
POlitus, Ecuram gnomonis peae le ferens; rami horizontalis BC in
Caperci diameter lineam seu duodecimam disitis larilini partem
non excedat; rami rero verricalis AB in Cummitate obstructi dia-
metes elto 4. linearum vel amplius adhuc, prout raciacionum, gra-
dus in hoc barometro masis sensibiles lune exprimendi, et rami hu-
jus altitudo sit, qualis in barolcopiis communioribus, 30. auF3I.
Dollicum; lonsitudo rero rami horizontalis BC, quae a proportio-
ne diametrorum ramorum pendet, 3. Dedum minimum eMle debet.
Si tubo sic parato Mercurius infundatur, et ramus ejus horizontalis
Pariter plenus sit Mercurio ad medietatem usque H circiter, aëre
exittente mediae consistentia, habebitur barometrum, quod 16. vi-
cibus masis sensibiles exhibebit rariationes, quam ordinaria baro
metra. Liquet enim, quod, delcendente Mercurio in ramo ver-
ticali ex spatio unius pollicis, progredietur in ramo horizontali ex
E in L per spatium 16. Pollicum; nam ramus rerticalis aliud nOn
eA, quam simplex seu commune barolcopium.
Ouod si vero ramus horizontalis angultior aut verticalis amplior
fieret, nemo non videt tore, ut rariariones crescane in duplicata
Td