dy the Combuftion, of: Hydrogen in Oxygen Gas. 15% 
frame ; the brafs clip 4 fhuts upon, this neck, and preffes 
it to the frame by the, ferews 27, To keep the ftopper 
@ firm in the neck of the adopter, a femicircular clip em- 
braces the brafs cap gf, and meets the fhoulder, of. the 
{topper d, From, this. clip two brafs pins enter the piece &, 
which being drawn, to the frame by the ferews //, forces 
the clip againft the glafs topper d, and thus faftens it firmly 
in the neck of the adopter. By the hke mechanifm the 
other neck of the adopter is made faft to the frante. 
The wire ie being moveable in, a well- -greated collar of: 
leather, the brafs ball.1 is turned round, when the hydrogen 
s has been inflamed ; and the wire Ae turning with this 
ball, the end e¢ is remoyed. to one fide from the flame of the 
hydrogen gas; the ferew m ferves to keep the wire in the 
pofition required, ’ 
Previous to the ufe of this inftrament the funnels are to 
be {crewed off: the oxygen funnel at f; the hydrogen fun- 
nel at the neck B of the adopter. The hydrogen {topper 
being removed, the adopter is to be rinfed with diftilled wa- 
ter, and, being again put in its pofition on the frame FG, is 
10 be left to drain, the tube CD being left open. After this 
the adopter with its ftoppers and vimphuded air is to be 
weighed: the hydrogen ftopper being then removed, the 
adopter is to be filled with diftilled water of a known, tem- 
perature, and the ftopper to be again replaced. By the weight 
of the water in the adopter its capacity in cubic inches: ig 
The fame ftopper is now to be taken out and dried, and 
oxygen gas, under a preflure of a two-inch column of water, to 
be introduced till all the water is excluded from the adopter : 
its orifice, being ftill under the water, is then covered with 
the finger, and another perfon ftands ready to introduce the 
ftopper, which has to expel its bulk of gas, fo that no air can 
enter againft this current of the gas.. The adopter is now 
faflengd to its frame, and the funnels are {crewed on. To 
h4 prevent 
