148 Apparatus for producing Water 
itfelf into the place of the other ; fo that now the bamgaresnir 
electrified plus. . 
Many other experiments of a fimilar nature were made by 
Mr. Wilfon, none of which, however, appear fufficiently 
conclufive: I fhall therefore fubmit the following experi- 
ment to electricians; and if it does not prove the permea- 
bility of glafs to the electric fluid, they will oblige me by 
explaining the way by which the balls in the electrometer 
are made to diverge without pafling the electricity through 
ithe glafs. 
EXPERIMENT. 
Cayallo’s atmofpherical electrometer was placed upon a 
glafs pedeftal, and covered by a thick glafs receiver, fo large 
as to admit of a fpace of above two inches between its fides 
and the electrometer. A charged jar was then brought within 
a little of the apparatus, and the balls immediately diverged 
confiderably, as reprefented in Fig. 2. Plate TV.» Upon 
touching the receiver with the knob.of the jar, the diftance 
between the balls was doubled; but, on the removal of the jar, 
they direétly came together. This experiment was repeated 
upon the air pump, and the effects were exactly the fame. 
VIIL. Defcription of the Apparatus employed by, the Society for 
Philofophical Experiments and Converfations, for producing 
Water by the Combujtion of Hydrogen Gas in Oxygen 
Gas: with an Account of the Procefs, Extracted from 
the Minutes of the Society. 1795. 
A B (Fig. 1, Plate IV.) is a light elobular veflel of flint 
elafs about twelve inches in diameter, in the manner of an 
abot having the narrow necks A: and B oppofite to each 
other. The lower part of this veffel is drawn out at C to 
‘form the tube CD, which: is provided with a ftop cock at 
; its 
