142 Compound, or Hydro-oxygen Blowpipe. 
Large Self- pig id 
Reservoir, for H 
en, as used in ion oe 
boratory of the Univer- 
sity of Pennsylvama. 
NS 
This —_ represents in Ly 
scribed in the preceding 
chapter, excepting, that it 
is about. 50 times eran 
and is, made of lead, 
stead of glass 
This reservoix is attach-., 
ed to the compound blow-.. - 
pipe, in ee to lear : 
dro gen; _ may, ; 
course, be used in all ex- | 
periments, requiring a co- 
to the xygen, or 
compound blow-pipe, (fig- 
scribed i 
next article) the knob at the end of the pipe, which has an 
orifice on one side, is placed under the gallows, (G) and fas- 
tened air tight to the pipe of that instrument, by the pressure 
of the screw of the gallows. 
Engraving and description of a Compound, or Hydro-ory- 
gen Blowpipe used in the listen of the University of 
ennsylvania. 
ago ; eat fearing it might be deemed unnecessarily com- 
Eo? Thave never Y pabliaied any account of it. Experience 
he complication of its structure, does not 
witrien it more difficult to use, than the simplest instruments 
