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# Title: Lexicon Technicum: Or, An Universal English Dictionary Of Arts And Sciences (shelfmarks Leibn. Marg. 71; ZEN Leibn. Marg. 71)
# Folio - , page id 806933011:0419
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(the part abddes Suis LLD) bears the same
Proportion to the Gravity of as much Air équal to
it in Bulk:: asthe Weieht os a Ouantiry of Mer-
cury equal in Bulke i ese part immersed; bears 10
the Weicht of the immersed part of ihe Tube toge
ther with the Mercury included C Lo
For elie Air upon che ourside D, oE che FOp OF
ihe Tube DC; is very nearty equaleo che Presure
ot che Air upon the octier Pares ot che Surtace oF
the MercurY A B; bur chis Presture upon the POP
ot the Tube, beins added eo etie Pressure OF che
included Mercurr, rogerher wich etie Weighe ot
he Tube, Will make the Presture upon C, inore
chan double ro che Pressure uxon any ocher Pari
beins ehc effect oF a double Column oF Air oF etie
e.
25 is equal es etie Exeess of che Pressure upon etié
orhet Paiis abore chac upon C; FoF etié Force up.
ards in C can suctain Pomueh MerCUry, aSIS COn-
rairied in a Tube, Wvhose Alticude is C Y: There:
Fore il chie Alcicude C D be lesorhen C, I; tis plain
che Pressure uiprards at C, Wvill be able to buor
up 25 muchniore weiphr chen D C, 25 D C Wanes
oFCI; char is, so much weistir mar becaken
ouc oE chic Senle P, 20brins il c0 2n L. quilitrium.
For, ehie Pressure ol the Tneumbene Rir upon che
Pares of the Surtace AB, Surroundins C, IS SuNI
ciene to sustain, cither a Column OF RIF OE an equal
Alricude, or a Column oF Mercury oF an equat
veishe wich che former; or a mixe Column inade
up oF em borh, wrtich docs noc exceed the Gra.
virs ot orie oEcheni, bur cannor fustain chem borti
cogecher, or any chins more chian Wrtrar is egual to
Me Crariey ol orie.
Scppose the pari C oF thie Surtace ot ehie Nereii-
ex AB, (FIs. 12.) exposed co che open Nir, etien
chere wvil be sustained a Column of che incuisibete
Ait, equal co ivtratis suctained by everr ortier equal
Part oF che Surtace, but neither MCrCUEY, nOr any
chins elle more Incensirely or Specitically heavier
chan Ric, LOF chac oud destros rhe siquilibrium,
By Prop. 1.
2. IF, 25 in the Torricellian Lxperimene, etricti
suppose made, che Pressure or the incumbene AiF
be kepetrom actins upon C by I, the Top oF che
Tube CI, Ox any hou else, the Pressure at C up
wards will chen suctain a Columnof Mercurr equa
in Glariry eo a Column of Ait uxon che Pame Base.
but ic ean sustain nochine else; (o chac elie Tube
wich che incumbene Coluinn of Air upon the TOp
oF ic, must be sustained some orher Way, cither by
cheFland, or by an equal Weiphe in che oppol
Scale, (361
3. IE elie Pressure ot the incumbene Rir Be Kepe
OH, onts in pare; chac is, it chie Pondus in the
Scale P, be lels chen che Graviry oF che Rir restine
uxon che Top oF che Tube, and che Tube ic selF.
then C will Fuctain a Misr Columm, (1. c.) Parcls
DF RIT, parE DF MerCUIEY: Atid che Onantiry OF RIC
sustained by C, is equal co che excelo ot ché
eveigHt oF che incumbene Rir and Tube abore che
Pondus P. Aiid etie Mercury ivictrin che Tube
wanes just so much of che Weisht oF etle Mereury
in che last Ca(c, a5 chat exCelS aIOUHES EO.
4. IEctic Pondus in the Scale P, De preater thati
the Weiphe oF an incumbene Colutn uxon etie
Top oF the Tube, cosecher ivith che Tube ir selF.
etien ie ivill elerare the Tube out oE the Mer
cury.
This Mactet Wvill Aill be more elear biy etic. Fol
loins Instances.
 the Mercury in ebe Tabe C D (Sec Fiz. G.) bc
kept suspended at the alritude C T, yet is the Ae
presate os the Tube and Mercury be lest 1o it sels
10 descena frecly; it ne sina luo the scaenant
Mercurs s0 far, ti the Grady of DI or DC.
Dianterer ot the Lube, and ee Weighe oF chac
Tube; and consequener, it ihc WVeighe ot ehie
Tube and Incumbene Rir, bC Hor sustained ocher
ivaYS, (by Cor. 3. Prop. 1.) InC Lube will subside
Totat, eill che Parr abore che Surtace bears che
lame Proporrion t0 as much Air equal roir in BuIK
as d Ouancier oF Nercurr equal it Bulk to che
Parl immersed, bears co ille immersed PaF
COROLLARY L
TE Mhe Fube D LBC Kept saspended vich ils end
C just under che Surtacé ot the Mercurr; the
is equal coml Crariey oF a Column oF RIr, insist
ins upon the Top oEche Lube DL, coscctet wictu
the excels of che Grarirs ot che Lube, above a1
equal Porrion ot Air; oi ivhich is nears ene latme
chirs equal eo the Weishe oF che includea Metci
COROLLARY II.
Buc is D C, ihie Altitude oF ehe inverred Tube
be lels then C P (vhere ThC MTUrCUEY, a5 in Z
common Baroineter, won d Rtand, evere ir noc hin
dered) and consequentY, it che RIr press mOre ux
on cheocher Parrs chan the MercuEY DC docsup.
on C; then wvill so much of che veishr ot ché Tube
anid Mercuer be abaced, or so much Weiehe ma
weishe of, or rendener of che Tube doinnivards;
ey D C, rogerter che Coretrientionec P. XCets.
be suxpoled ro be caten our or che Scale P, (F15. 1:
indiriiiiiii
uoae (213. La Clut Palt et ee dullace
AB, upon which the Tube insilts, c0 be (0 larse
25 chac, beins exposed ro rheopen dir, ic can lu
Iam a Colu et alt et 10 Ounces: Then il che
Forricellian Experimene bemade, and C be detend.
ed trom che Graricarion ot che Air upon ic, them
ill in ies room be suspende a Columin oF Mercu
eY, or any ocher Fluid, irhich does nor exceed 10
Ounces.
Let us imagine che WeipheoF che Tube ro be
cuo curces; alen vil ie l eiebe dt 1 L do
1dcd