1000000030

numher oT [111.111

im"~

rr<fcroillc to brge one'. If wOltrl,

f".1\ in k\l);:h. Let

Ih;~

he covereJ wid,

tin

onc of thCI11 nlOulJ

~I'~.k

hy an explufion or any ulhcr or

\Upp~r

,eI!;·1

(1, )

¡¡1.lpeJ lile. funllcl , tCl prCVenl in e·

accident, Ihe 10!5 is Icfsconftrler,ble; befldes, by me.ln9 I'er

b"ln~

IVtUCJ ;

~bovt

Ihis, let lime rife • long Oenda

of nJrro\v'

jar~,

a I\l cater f"rec (that is, a grealer q".n· roJ C, ICI

min~¡jnr.

in apoinlcu wire,andhavin3

fmal! wire

tilYof cOlleJ furface) \llay be conlained in Icfs rllLm. twlileo roul,u liS",hole length, Ihe beltCr

condlh~

Ihe

Th~ l>r~efl

j,rs are ab'Jut

inches in

hei~ht, ~IIU ele~\ficil y

lhe funnc!. FrOIll Ihefunnel makea wire (d)

fllOllld nut he 1110l'e lh.m 3 in dl.lmeler, and ol" Ihe

fal11~

cI&enu .lllIng Ihe builJing, about a fuut JiflJnce fromil,

"ilidllhrough\l\ll. Thlls Ihey maybe eaftly COaICUbud, ,"d cOlldll,qed through an open f. OI into . ny roomthu

\Vlthin and wirhout, ,r.d

box of a mo!!owc fize IVill {h.1I

01,,1 eonvcnient for m.lking Ihc

e~perimcnt.

r~ntain

a prodigiolls

furc~ ;

for the jm bei ng eoatcd thlSroonl, let" proper eonduélor be inflllJtCu, and cr.n·

within tIVO inches of the top, cach lI'il! contaio

fquare oeéled IVilh the wire conling in at the ",indolV. This

foot of coateo glafs Thebancry(Plm LXXIII.lig. 3.) wire aod con¿uélor, beiog cOAlplm ly ioful,ted, wil! be

confins of 64 jus, m h

inches loog, ,od

20}

in dia· eld lrificd "'''toever

th~l e

is a confiderable quaotity of

meter, comd wilhinan inch ¡nd

h,lf of the IOp. The ekélricilYin

Ih~

.ir. And nOlice will be givro when it

coated pan of each is half a fquare foot; fo Ihat Ihe is propeolycharged, eilher by Mr Canton'sbal:s hung tO

"holeb. ller, contaios 32 fquare feet. The wire of each il, or by

fll of bdls difpofed in the following manner.

jar has a piece of very fmal! wire

t~vin~d

¡bout the 10\Ver Take thm bells; fufpeod (he two omermon fromIhe

cnd of it, to touch the lIlftde coaung

fevml places l cooduélor by chaios, and that in Ihe middlc by a filken

3nd it is pUl through a preuy I:lrge piece of eork within lIring, while a ch,io conneéls it with the Roor; ,"d

thejar, tOprcvent any pan of it from touching Ihe fide, haog t\Yo fmal! knobs of Grafs by fil ken flrings, one be·

"hich would teod to promote a fpoolaneous difcharge. tween each tlVObells,

{erl'e inlle,d of c\' ppers. In

Eachwire is turned rouod, fo as to make a hole or ring coofequence of this difpofition, when the t"'o ourermol!

at the upper end; aou throogh thefe rings a pretrl' thick bclh, communicatingwith the condllélor, are olellrified,

bnfs rod wilh koobs is put, one rod ferving for one rolV . they wil! atlraél Ihe cbppers, aod be IIruck by thenl.

of the jars. The communicalioo bCllveen Ihefe rods is ,The c\appers bcing Ihus loadea IVilh c1célricity, ",il! be

made by I.yiog a chain om themall : this chain is OOt repelled, and Ry10 difdlarge themfdves upon themiddle

rcprefented io the pIAte, len the figurefhould arpearcoo· b:ll. .'\ iter Ihis, the cI' ppers ",ill be ajain ,nr,lled

fufed. When only a pan of the bmery is tO be ufed, by the oUlermon bdls; and Ihus, by IIriking the bells

the chaio 010uld be laid over as many rods as you lVant alleroately, a contioua! ringing may be kept up as long

rows of jars. The bOllomof the box in which all the a! Ihe opem or pleafes. In the dark a contineal Ra{l\ing

jars naod is cOl'm d with tinfoil aod brafs. dun; and a of light \Vil! be feen be(\Yeen the c\Appers and the bells.

bent wire touehiog this tinfoil is put through the box, But wheo.the

elel~rificatioo

is very IIrong, thefe Rafhesof

nnd appears 00 the oUlftde, ' s inthe plate. To this wire light will be fo l;rge, that they l'Iill be tranfmined by

is faflened whatever is inteoded to comllluoicm with Ihe the c\apper from ooe bel! tO Ihe olher, Wilhout ilS ever

outfide of the battery, as the piece of fmall wire io Ibe coming to aélual conlaél with either of them, and Ihe

figure; ano Ihe uifcharge is Rlade by bringios the brafs ringing will

confe~uendy

ceafe.

knob tO any of the knobs of the banery.

Widl regard tOthe cooOruélion of machim for elec·

To difcorer the kind aod degree of eleélricity, many trical

exp~llments

in generol, that of Dr Prie!lly, repre·

forms of ELECT ROMETERS hove beenthouglHof.

~lr

Ccntcd on PI, te LXX III. fiS.

2 .

is perhaFs the bell.

Caotoo's balls A, repreCented on a

gl.fs

flaoding on the

Th~

Fu"

r conft:ls of tlVO fl rons boards of m/hogany,

í!ool

(PIJte LXXIII. fig.

l.)

Cme

10 Meol'er Im.1I

(na ),

of Ihe fame IcnSlh, parallel

one

3nothe~,

abollt

<I~grees

of .IeélriciIY, tO

obfer~e

Ih; changes of it

fl ~m

Cour inches afunJtr. and the lower one is an

IOch.on

polilive to oeg>.tive, and

efl:mate the force of ,O,o:k e_ch fide bro.der Ihan Ihe upper : in Ihe upper board 1$ a

before the difcharge. Thefe b.tlls are t\Yo pieccs of groovc

re~ching

, Imoll ils ",hole leoglh. One of Ihe

cOlk, or pilh of cld:r, oicely turned in a I:nh 10 abollt pillm

whieh are of bakeJ wood, is immo,eabl,.' be·

the fize of a

r.lu~

pea, and Cufp{Oded 00 Cmall lineo iog let IhroHgh the opper board, and fi rrnly fixcd

Ihe

thrc,d~.

T htfe b,lIs repell one anmher

difl.nc:

s ex· lo",er; while the olher pillar Oídes in thegrool'e above·

~clly

propc.r:ioned tOrhe qU201ityof elef.ricilY contained menllonld, inorder tO receive globesor c)'llOder$?fdlffe·

Ih~

vcfi'd or olher fubnaoce with \Yhieh they are coo· rent fizes ; bm it is ooly wanteu ",h:n an axis

ufe~

oeéled; ar.d by ¡ilis work the operator koows rrwyex· J:",h the pillars are perforated lI'ilh holes

equal .dl'

381y the fore: of the tharge, and the OlOck tlli.t \ViII be

lI.nw

flol\1 the lor

the bOllom; by means of

~h\Ch,

given.

Alobes m,IYbe mountro higher or 10\Ver accordlOg Ir

In orcler

repru the exrcriment

tenuio~

tO O,ew Ihel; file ; and Ihcy are made \dll . tO,dmit Ihe ufe o

, hat the clearic

~"i'¡

Ih~

I,me with Ihe mAtlCr of t\\·o or Ol'Jre globes

a lime, one abol'e another FOllr

¡'~htnlng.

and

nlJke

v~felvatlvns

00 the d"'trici:y uf of • Il1nJ!raIe lile mal'

uf<d. ií

t~'O

be fixcd on ";,e

Ihe alm,,[vhuc. the l:r·.31 iCUlII ihl1l1ld be 1'">1ukd ,,"h axis: "nJ ,he whd

h.ls

feveral groov<s for rhl!

purpo:~

MAClII ' F.

fnR nRAl'/ lNG rLECTRrCI ry f'O \! THE

If a globe Wlln only one n. ,;k be ufcd, as In I

no uso T:,e bcfl cooflru/bnn of

1I'~lldl

is die fullo.1' P\'lIe, a

!'r.l,

.mn, wilh

opcn frtcket

is nec:!fJr,Y

in~:

On the

uf any

Lu,IJin~

"re,'! " role

PL,te

{upPOrt rh- lIxi,

b~yond

Ih" pu!ley ; anJ Il1il put. 1

LX. I . fi¿.

~. ) '~.

t.1113S • man elll \Vell"

I::e, Itl' alfi, c.l'.lIil'lIl 10 he 1"

hi¡;hlr

In\Yer, lorhcr

.~:t~

',r" 00

t1w

tOP of It

lolul r ece of lbl , • ur

~ak,u

th<

~ral

lucku

whi,;h tile

)JS

IIJoJs. fIJe

•