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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 806933011:0106
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e
ing Ark ground roueh, eo make ic sick) che Hole) ur inco rhe Tube CD: Avd chis is s0 cender and
in ; rhen openins thie ITole in B, dran oFE as (nice, char while l as in che Rcom, and lookine
much oE che Mercury oF che C ane B C rill ic wil
run no longer; Which donc, sop Armly che Hole
in B (Which rou may do as yon please, there be
ins no Pressure against y0u) and you vill have
ehe Cylinder A cracuared ot sir for jour purvole
on ic, wrhich was nor abore an Llour, che Mercu
ry alcended near tuo Tuches (For Rain) in the
Aope Tube.
One Breat Adrantage chis may ot managine
2 Slovins Tube leems ro have aborerhe Common
and the heighe of che Mercury will be a5 utual in One, whieh is, chac che atercury here mores ail
che ordinary Plain and rVheel Barometers.
Then pour into che Cane B C a5 much Spirit 0.
Winc cinged wich Cochinele and Oyl oE Furpen
tinc, equal Parrs oF cach, 25 Mall Hand abore rhe
Surtace ot the Mercury (0 manr Feer a5 vou make
the enlarsed Scale ot vour Barometer, Or 25 is bc-
cogether in a Body, withour breakins or drapoins
a Fail astex ic.
Sec ihe Figure of the Plate belongins to theWord
Air- PumP.
Daroscope Statical: 50 DAr. Boyle CalIS ar In-
Rrument Wxhich he invenecd eo eltimate ihc Va-
erveen che midale ot che Cylinders B and C, and riarions ol che Airs Craviey, and is chus de-
rou will find che Mercury Cinke in che Cane BC
and rise in the Canc AD, in such proporrion, char
cach 13 FOOr OC Oyl and Spirir, will raise che
Meroury 10 Tnches: Then you must pour on, by
scribid.
A verus laree and chin Cla(s Bubble sor it such
an one cannor be procured, 2 or 3 Imaller ones
added rogether may d0) was connrerpoiled in 3
cheCane BC, (omuch Mercury as will AII up the very cender Balance Whiel wouid curn vich che
Oylinders A and B ro such heiphes; considerins 6tch part of a Cirain, and chen ail beins hung ux
ehe present eishir ot che Armosphere, chac che in a Frame, he Found chac as rhe Air siewr lisbrer
Surtace ot che Mercury in borh, may ac the urmost and chinner che Bubble vould prexonderate rery
Cimirs, (rhich hare noc in Ensland, been Found manifestlr; bue wben che dir Brew chicker anc
20 excecd 30, 6 and 28, 6 Inches) alvays Fallwich. denser, che Scale in which che Weiphis were
in che Bodies ol che Cylinders, and never enter vould sron heavier, and moune ux ihe Bubble.
into the Canes
And ehis Ffect he found mould continue, and an
The Efect oF chis Baroscoxe will be, char irtien Eiver exactly ro che rile and EaIL ot che Mercury
the Armosphere is heary, and che Mercury railed
hioh in cu lindet A, ade LeMe Out OI B, IHC
Spirit of Wine will descend inco che Cylinder B
and che Oyt of Turpentine ill AIl che C anc, (0 a
o make che Parririon ot che tro Liguors near che
Exlinder B. Bur on The ContrarY, Wtien the Ai
is lixheche Nercury will Sink in A, and rise in B
(0 a5 co drive che Spirit of Wine into che C anc
and enc est os urpemm o iet l, le
thac che Section oF thervo Liquors will benear C
and che vallarion oE ite heset ne Mc
Wvil be enlarsed inco almost che lensch oE che
Cane, wichout chac che Couneer-presture From the
in che Common Barometer Or Baroscope.
The Crrounds on which chis Nroble Genelemman
wene in concrivine chis lustrument vere chele;
1. Ie considered, chac though ac tirst serting of
ic up ihe Bubble and rhe WVeighes Wrould be in
Equilibrio, becaule he caretulls made them (0;
vet che Bulk of che Bubble did excecd rhac os rhe
Mecalline Councerpoise, by near 200 rimes (be it
more or lels accordins r0 the Graviey oF the
Weighes uled) and chieretore he considered,
2. Thac, accordins ro the Lawsof HIydrosca-
Cticks, wrten ervo Bodies beine ot ihe Pame ab(0.
lure Weighe, bur very differene Bulks, come ro b0
weiphed in anocher Medium, thez can no longer
be eguiponderane: For if the Medium De heavier
or denser, the orearer Body vill be more buoyed
up chere chan ir was betore, end constancty
Wwill abare ot its WVeizhe; buc it the Medium
Mould De lighrer and rarer, the contrary effect
than che Bubble. He considered alEo, chac chis
must be rhe cale os che Air, Wwhole Specifick Gra
viry is continually changins, accordins co the va-
rious FMuria ic receires trom the Perraqueous
Olobe; and consequenelz, rhar ic must needs be
The Torricellian Experimene is made in a Tube now denser, non rarer, and accordingly more o
sels Duoy up che Bubbie.
Oue Auchor BinEs, ehar ehis Instrumene is ca
pable oE several Improvenienes; and thoueh in
nany Cases ehie commion Barsscope be preterrabe
Mercury; and chese may helo us to guels arrhe
Will be more in ihe Cittem, and oness (much is wanrins 1s beins ihe scales 0 an A quili
Liquors will noc be in che least alcered, the TPeigh
and Weiphr oE che Incumbene Cytinder beins al
Wars che larie
The Ingenious Mr. FTautesbee (char invented che
nel Cupping. Classes ichour Fire, no generalls
used: Sec his sir-Pump) Mewed me a Baroscopt
very erear case, and withour brealcins or divi
ding; and ic may very casils be made tor 100 Ol
200 Lches, iF a Arair (maii chin Clals CiDC Can
De blovon and dravn ot chac lense, anu lat Il
vese as casily manaseable
OF abour 3r Inches in lensch, writh a (mail BaII Or
racher Cylindrical Cariry on theTOB; ac the BOF-
eom ot ehis TubC, aE B, is a very lmall C iltern
Wich Mercury in ic, and communicatins wich chc
Free Air, into which che lover End ot the Tube betore ir, ver this hach seme Adraneages above
AB is Dur; ihen ac a very Acure Anole is che ThaC; 25, 1. Fiac chis is more parable chan che
(malI Tube C D placed wich ils open Oritice in ocher; for many Pertons can more casily get 2
che aforelaid Cistern, and just under the Surtace, pair ot good Scales and a Crtals Bubble, chan chey
ot che Mercury in ic. And chus ntien che Armo- can a Pube aud esercury Fer the common Baro
sphere is high and heavy (chac is in der and fair, scope; and ehis a.(0 is niselt reOre casily FErCa uN
Weacher) che Mercury beins pressed ux inco che (than ThaC. This Staricat Baros cepe is alE0 much
Tube B A, leares bur licrle in the Ciltern, and more casily carried trom Piace r0 Place. This
consequener chere is buc a lierle weishr ot Mercu- Baroscope may De adjustes ro che ordinary one
ey chere co prels any our into rhe Tube CD, and) by findinqu Whar Weiphes arsiver exactly 1o every
consequentty ehen the Mereury Will FaII or dehass quarrer oF an Inchi ot ihe rile and tall ot che
Scend towards C. Bur wrtien in contrary Wea-
ther; the MercurY FaIIS our of the Tube AB chere usual Variacions of che Wearher, by seving hon
ehere che Mercury rose and fell 60 Tnches ich vould follo, and rhe rcishie ould be heavier
ehe Mercury musc alcend surclier oi rum triehet (brium.