.[i9i] 
part of this wire fuitable to the height of the con- 
ductor, and fixt there by a fcrew. A crofs wire WX 
is fixt to this piece with a moveable joint towards W, 
fo that it may be drawn up or let down by the filk 
firing Y ; one end of which is fixt to the crofs wire, 
and the other end pafies through the loop V. 
X, a fmall brafs knob at the end of the wire. 
Z, a bent wire, which forms the communication 
between the difcharging frame and the outfide coating 
of the jars ; one end of this wire is ground into a brafs 
loop at a, and the other into a loop of the fame kind 
at e t which is foldered to the tin plate that lies under 
the jars. 
i>C, an electrometer, which may be fixt on occafi- 
onally. When the difcharging frame is ufed, the' 
body upon which the experiment is made is placed 
between the nut S, and the end T of the upright 
wire, which is brought into contaCt with it ; then the 
wire WX is drawn up to an ereCt pofition; and, after 
the jars are fufficiently loaded, it is let down upon the 
conductor by the filk firing Y, and difcharging the 
jars, the eleCtrical (park in forming the circle pafies 
through the body. Care rnuft be taken to keep -the 
glafs pillars dry and clean, that none of the fire 
be wafied. 
When an animal is to be killed, he muft be fattened 
to a board, and his head placed between the two points 
S, and T. If the difcharging frame be removed, the 
apparatus may be ufed in medical cafes as ufualj either 
with- an electrometer or without. 
3 
XX. Two 
