[ 4 ° 7 13 
XXIII. Extraordinary EleBricity of theAtmofphere obferved 
at Iflington on the Month of October, 1775. By Mr. 
Tiberius Cavallo. Communicated by William Watfon, 
M. D. V. P. R. S. 
Ri Mar. 1 2, X 3 E F OH E I enter on the particular nar-»~ 
i7/6 ‘ -13 ration of the obfervation made with an* 
electrical kite on the 1 8 th of laft OCtober, it will be 
neceffary to give an idea of the fcale of my quadrant 
electrometer ufed on the occafion, which, being con- 
ItruCted in fome meafure different from what are com- 
monly fold in fhops, will, no doubt, give an unfettled 
idea of my narration, by expre fling the fame intenfity of 
eleCtricity under different degrees from the others. In 
order to this, therefore, it muft be obferved, that, when 
the kite is raifed, I generally conneCt with the end ot its ■ 
firing a fmall cylindrical conductor, nine inches long and 
one inch diameter, made of pafteboard covered with tin- 
foil ; with this I conneCt the quadrant electrometer, which 
fhews me exaCtly the ftate, increafe, and decreafe of elec- • 
tricity. The apparatus being thus difpofed, I have ob-~ 
ferved, that when the electrometer is at io°, a little 
bran prefented to the conductor will be attracted by it at 
the diftance of about fix-tenths of an inch; when the 
electrometer is at eo°, the bran will be attracted at the 
diftance of one inch and a quarter; when at 30°, it will- 
be 
