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# Title: Phoronomia, Sive De Viribus Et Motibus Corporum Solidorum Et Fluidorum Libri Duo (shelfmark Leibn. Marg. 182)
# Folio 377, page id 1066518432:0405
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DEVLRTBDS EX MOTTBOS CORPORDH. LIB. II. 377
S CH OZ 4ON.
660. FX hac propositione jam elicere licebit modum metiendi
agicationem particularum aeris. Flabeatur tubus ADM instar siP hO- F1B. 248
nis reAexus, cujus crus minus AD capsula ritrea ABC instructum
sic, et majus DM hermetice ligillatum in M non nihil excedat lon-
sicudinem fstularum in ordinariis barometris adhiberi Colitarum.
Cempore hyberno tubus mercurio impleatur oriticio aperto A deOr.
Cum spectante, atque ramo DM in verticali situ detento, Parte D Cur-
Cum respiciente, quod opc alius tubi inflexi atque aperto oriticio A
inserendi rite praectari potest. Totus tubus mercurio plenus inrerti
debet, uc denuo in litum, quem schema monstrat, reducatur, mercu-
riuSque in ramo ND ad contuctam in ordinariis barometris altitu-
dinem DFI, 27. vel 28. digitorum se demittet, eMuente per aper-
cum orificium A CuperAuo hrdrarorro. Scd, quia captula ABC ad-
huc mercurio plena erie, suctionis modo tanta ejus copia extrahen
da, usque dum relidui superticies FF st circiter in medio caplula,
vel paulo altior, ita ut BF aut CF sint 3 totius altitudinis caplula
BC. Claulo postea oriticio A, at que adeo lublata communicatione
aeris in ampulla cum exteriore, instrumentum ului aptum atque
Paratum crit. Ponamus enim aërem AFF calore extendi in spatium
APE, ita ut hrdrarorrus in altero tubo ex II astursat in P, columnae
IE. pressio aequiralebic impressioni aëris AF P in lua bali HB, atqui
haec imprestio (5. 659.) est, ut factum ex quadrato celeritatis medix
particularum aeris in densitatem aëris. Vocetur, ut in propolitionis
expolitione lococitato, relocitas media V, eritque aëris imprestio in
superticiem EE, ut V2: CK, nam densitas aeris AF F cst ut I: AF vel
P: GF; est ergo IR = V2: GF, vel IK. GH = V2 = 1C. OH, 1. OF =
V2. FLinCV =V(IR. GF.) aut etiam = r (IC. OF, + OF Z). PrOPterCa,
AIVOCeNtuE FTI = a, FK. = =b. DiamCter tubi HID =C, EE GF = e, aC
denique variabilis III =a, invenietur V, scu relocitas media par-
ticularum aeris, ut V (ab2C = bCX + bbcCX + abbccx + bbccax +. C2X X):
bb. Hinc data x in aliqua obserratione, innotelcet ultro ipla V.
Ouod erat demonstrandum.