DI S$- 
tenths of inches, fo difpofed, as to indicate the i 
ditance between the furfaces of the balls A and E, when 
the edge of the milled head is — any of thofe di- 
wifi ons. 
from each other, and that a metallic wire, or chain, or other 
ee communication, is formed between the outfide 
ital or battery, ~ the part F G of the difcharg- 
ing cle! ‘trometer, Then let the eleGrical machine which 
charges the j: xt or battery be put in adiion, and it is evident, 
that when the charge is become fo kizh as to be able to 
leap througa the interval of one inch, vz. from the ball A 
is the bail E, the di ifcharge will be made without the ap- 
plication of any difcharging rod or any farther interference 
of the operator, Thus by leaving the apparatus undifturbed, 
and continuing the motion of the elcGrical machine, fhocks 
precife'y of the fame ilrength may be fent through a human 
being or through any other fubftance, that may be inter- 
ofed between the outfide coating of the j ale or battery, and 
the part FG of the difcharging electromet 
If the wire C is fixedin a hole on the ‘prime conductor 
of an ele&trical machine, and a cation be made 
between the and the groun nd 3 then, on workin 
the electrical machine, fparks of the fame ftrength may be 
. This equa- 
quency of the {parks which pafs at any given nce. Mr. 
Lane found that the quantity of eleGtricity required for a 
s the diftance of the furfaces of the 
difcharge is fimply a 
balls A, E; the thocks being twice as a oaes when this 
diftance is onl f an inch as when it is yy 
Mr. Nairne fimplified this eleQrometer in ie manner € 
hibited in fig. 15, which confifts of a aes giafs arm, hav- 
> ft 
ough the other wooden 
termination, B, of the eleftrometer, a a wire paffes, which hasa 
moved backwards and 
e 
nduétor, arther management of this eleCtro- 
meter is the fam te sae aide 
nother fo af difcharging E eaoinetee is reprefented 
in fig. 16, where B C is a wire knobbed at each eee eh and 
‘moveable, like the beam of a balance, upon the pillar P. 
Ai is another brafs ball fixed upon another pillar, age a pete 
which is capable of adjuftment, up or down, 
tQ. 
and upon this pillar, which holds a hitle alee, the saa 
oOo 
Oo 
» mult 
repulfion which takes place between the balls A arg B, will angula 
elevate B, and, ss — hs ie C, fo as to bring this near 
DP, and efi & th 
Other forts x difchareng cleftrometers may alfo be feen 
DIS 
in the prctephen Magazine, vol, xi. 
tricity, 
The Uatsaefil Difcharger = invented by Mr. Henly, 
and is reprefented in fig. 17 confitts = the folowing 
s » fou 
Cuthbertfon’s Elec 
vertica Each of the wires DC, 
, is furnifhed with an open ring at one e end, and at the 
other end hasa brafs bali D, which, by a fhort {pring focket, 
circular eu E, w moved. 
rom what has fa fai above, refpeting the other dif- 
charger it will be eafity underftood, that this univerfal dif. 
charger May be adapted to anfwer every purpofe, by con- 
neGing theends C, C, of the wires with the fides of the 
Leyden phial, and pales the fubftance through which the 
fhock is to be pafled between the brafs balls D, D, upon the 
board E, or between the boards of the prefs H. The balls 
-D, may be unfcrewed, and the pointed extremities of 
the wires may be uncovered, which is of ufe in certain expe- 
rimen 
commonly known by th 
a colour being afterwards difcharged in particular places, 
number of white {pots are interfperfed upon the 
oaand. The procefs is by no means complex, but as the 
manufacture is recent, has hitherto been chiefly, if not en- 
tirely, gonfined to the diftri&t where it originated, and has 
been much admired ; an account of the engine employed, 
and of the procefs, may perhaps deferve fome attention. 
aod of calico sintine. “But the ecleun of the printed 
handkerchiets, 
