1 52 Apparatus for producing Water 
prevent the hydrogen tube from introducing the atmofpherie 
air which it otherwife would hold, oxygen gas is — . 
through it from the fmall extremity. 
“The funnels, the capacities of which are determined by 
_ meafurement, and marked at the different heights, now con- 
tain atmofpheric air confined by water, which is to be fucked 
out by means of a flender fyphon : when the oxygen funnel 
is thus emptied of its air, in order that none may remain im 
the neck, oxygen gas is to be introduced and fucked out re- 
peatedly. Then it is to be charged with the fame gas, and 
the ftop cock to be opened to allow a free communication 
between the gas in the funnel and that in the adopter, 
which is now left to drain for 24 hours, at the end of which 
time the water which has gathered in the tube C D is to be 
paffed off by opening the Sale D, which mutt jutt touch the 
furface of the water in D, that the oxygen gas in the adopter 
and funnel may accommodate itfelf to the anes temperature 
and preffure of the external air, which is to be noted, and then 
thé cock to be ftopped. The water on the outfide of this funnel 
is to be kept two or three inches lower than in the infide. 
The hydrogen funnel d is to be freed of its contained at- 
mofpheric air by the fame means employed for freeing the 
other funnel, and hydrogen gas is to be repeatedly intro- 
duced and fucked’ out. “At laft it is to be filled with mea- 
fured® quantities of this gas to the lip, which is to be com- 
preffed by a column of about four inches of water. 
The apparatus is now ready. The ball k of the eleétrical 
~ conduétor, charged by a good machine, is to be brought near 
to the ball i; ‘and while the fparks' pafs in quick fucceffion 
from the wire A e to the point of the tube B e, the cock at f » 
is to be opened quickly, fo that the firft portion of hy drogen 
gas iffuing at ¢’ may be inftantly inflamed; the wire is then 
‘to be turned away from the flame. The combuftion may be 
_ aceclerated by increafing the column of water which preffes 
"the hydrogen gas, and leffening the preflure on the oxy- 
gen 
