Analysis of the compound inflammable Gases. 287 
by a bent glass tube s s, the diameter of which should not be less 
than ~ of an inch, to the upper extremity of which is cemented 
an iron burner, t, the orifice of which is about of an inch, 
while to the lower end a socket is fixed, on which may be oc- 
casionally screwed the cock r. The receiver 0 0 is contained 
in a larger glass jar n n , and is closed at the top by a brass 
cap p, and stop cock q. The oxygen gas receiver is, also, 
closed by a brass cap e and cock/, the lower orifice of which 
is tapped internally, for the purpose of receiving a small 
screw at the end of the copper wire g. This wire is in two 
parts, each of which screws into a moveable socket, connect- 
ing the two ; and, by this contrivance, the wire may be 
lengthened or shortened at pleasure. To prepare the appa- 
ratus for use, the receiver 0 0 is partly filled with the combus- 
tible gas ; and is secured by wedges of cork v v, in the jar n n t 
the level of the water in the latter being regulated by open- 
ing the cocks x or z. The bent pipe s s, with its cock r, is 
screwed upon the top of the receiver, and partly immersed in 
the v/ater of a pneumatic cistern, a a , so that the orifice of the 
burner may rise a few inches above the surface of the water. 
The receiver h b detached from the situation in which it is re- 
presented in the drawing, is then exhausted by ait air pump ; 
and, being filled with oxygen gas, is transferred (its mouth 
being closed during the act of removal with a piece of leather ) 
to the cistern a, and quickly inverted over the burner t. By 
a little practice, this may be done with the admission of very 
little common air. A transferring vessel is then screwed 
upon the cock f ; and a portion of oxygen gas removed for 
eudiometrical examination. To allow room for the expansion 
