28 Mr. cavallo’s Account of fame 
merited by means of fealing wax. From the extremity 
of this fmall tube another wire fg proceeds, which, as 
well as the wire ei, is bent at the top, fo that the extre- 
mities of both wires ef may be about one tenth of an 
inch from one another, gh is a fmall wire fattened to the 
wire fg, and to the extremity of the handle, fo that 
when the inftrument is held in one’s hand, this wire 
touches the hand, k is a fmall cork-ball electrometer,, 
which, when the inftrument is to be ufed, is affixed to 
the pin d, which proceeds from the wire ie. When ex- 
periments are to be tried with this inftrument, the elec- 
trometer k muft be affixed to the pin d, which proceeds 
from the wire ie, and muft be electrified fo that the cork, 
balls may diverge as far as poffible : this done, the extre- 
mities ef of the wires are brought within the effluvia 
that are to be tried, which, if they are of a good con- 
ducting nature, will complete the communication be- 
tween the two wires ef, and difcharge the electrometer of 
its electricity, otherwife the electrometer wall remain 
electrified for a confiderable time. 
The experiments which I have made with this inftru- 
ment are neither numerous nor fo often repeated as to 
be depended upon, excepting one only, which, perhaps,, 
k will be not ufelefs to mention. I found that the fumes 
arifing 
