DIS 
vefutts to other non- — fluids may be eafily made, by 
uliar fpecific gravities, adhefive acaities, 
ther fluids 
of non-elaftic 
fluids through gaia sa a pried pipe saity ought 
o follow with re{pe ifcharge, or tranfition, of 
arent ftuids. oa apertures, * xe. O 
only fubjoin a few of the mcre general 
pirticulars, withoot any theoretical demonftration, or prac- 
tical illuftration ; bot as thofe tranfitions or difcharges of 
uid, are entirely ewe ent upon that property by 
are diftinguithed from w 
nde rftood, in lag aa wit 
which 
NEU 
raCtical remarks, relpeBing the following and other par. 
ticulars, will = Air rom the -atmofphere 
Into a vacuum F veel. exhaufted of air, with the 
velocity which a ig ee body would acquire by falling from 
the top of au oe ana ate ; which enEne may 
be reckoned equal to 278 
Pat D for the sree pe of the air in the atmo- 
he air contained in a veffe)_ partly 
ing into a void, a 
ruth into the re air of the denfity 3; thenu= V x 
I1— P is an expreffion for the velocity with which the 
air aa al eae will rufh into a {pace containing 
rarer a 
len aths, na &c 
thefe circumftances. It a 
liar seek - - elaftic fuid ¢ 
E of oe re. 
TRICITY and LEYDEN 
Fria rie aaa Wonk in Calico: Printing. 
‘g 
ills according to he pecu- 
See 
e-Wor 
‘DISCHARGER, in iordiaens ig an inftrument which, 
two coati r the two 
mott ¢ffen- 
tially nfeful are of three fpecies, the fimp left of ey has 
received the denomination of ia mple di ae or difcharging 
the di ifharging eletrometer ; 
univerfal difcharger, from 
its being capable of anfwering all ae principal objcets which 
may be defired in difcharging charged eleCtrics. fha 
now defcribe thofe inftruments in the order of their fimplicity. 
The saga D Dyehargers or on as rging Rod, is a metallic 
wire, about t of a quill, fometimes ftraight, but 
m e LIL, Eledricity, Sg: 10, and 
kn ears odoin a at 
; r 
difcharged, the operator holding a detain ae . its 
mid 
dle A, firft applies one end of i 
rings the aa ecu of the rod 
oye 
See the articles Evec- 7 
DIS 
erful, the operator is not a fafe ; ‘for, in the firft place, 
he’ will feel fome effeét of the fhock, in confequence of 
what is ee in seer, the bias nage 3 and fecondly, 
if he happens to touch any ne of his body, any 
metallic Saute ~~ one fide of the jar, he may run 
the rifque of having whole fhock ieee his bo ody. In 
confequence of this inconvenience, an pallet ee e id 
been added to the preced ng difcharging rod, as 
ig. 11, where A B is a glafs handie, having a brals Penile, 
BC, cemented upon its extremity, and the rod pafles 
through a hole in the brafs ferrule at C. In ne an dif- 
cnaeing rod, the operator holds it by applying his ile 
which cafe he becomes perfeGily feparated fro 
re circuit of the ae 
that they cannot be conv 
various fizes and various ee 3b 
ved the sa bee a pee in fig. 12, whic 
confits of a glafs curved wires B, B, 
which are moveable, like a an a ener by the j eke C, 
< 
z8 
4 
a 
ss 
a 
fr) 
v1 
a 
[os 
et 
© 
a 
o 
o 
g 
D 
a 
OQ 
3 
ae) 
° 
ww 
- 
é 
n 
So 
» 
o 
‘Etio n are 
cording as the experiment may r aie wires 
are moveable, fo that the persis D, D, a be placed 
nearer to, or farther from, each other, the eS -— 
may: be adapted to {mall as well as to large jar 
coated plate of ki , in fhort, to all forts os aaee 
eleGtrics. Mr. Nairne contrived a difcharger, which he ufed 
put up in the boxes with his Bs ae eleGirical machines, 
and to which he gave the name he = eee aif- 
evident that fuch a difcharging rod cannot be adapted to 
jars of — fizes. In making the difcharge of a jar with 
- room, and even in the day light, an {parks 
are feen biges the links of t hak within be, in 
confequence of hae cn. aictauene rod has obrised the 
epithet of Jumin 
The Dif barging "Eledtrometer was originally contrived by 
re Lane (fee the Phil. Tranf. for 1767), and its ufe is 
site an eleétrified c conductor, .or 
difcharge itfelf, when the intenfity of the eleGricity in it, 
or the height of the charge, has reached a lia particular 
i hig which degree the operator may v t pleafure. 
e Mr. Lane’s original invention, this aaa: has 
a aacoke various alterations in the hands ha diferent 
eleGtricians ; but the principle remains the fam 
a2 ene ap inftrument, A B C is all of brafs, VIZ. B ee 
wo krafs balls A a a B. a hole in the 
e bent glafs arm, (which 
To 7 ae 
mity of the vertical part of this as abrafs b ball F 
G, the wire G E may a "forewe 
i al E may be fituated ae avy ‘oud d diftance of 
A divided fcale D H is faftened to the ferrule 
aay 
a Ae ~ brafa ball I, and it contains the d:vifions of oa and 
5A 2 enths 
