Compound, or Hydro-orygen Blowpipe. 143 
intended for the same purpose ; while i cates are : poeslaeade 
susceptible of advantageous adjustme 
Bis a brass ball, terminating in a Se w. above,, and 
which commences with the lower screw, and ica perfra with 
the upper one. Another perforation, at right angles to this, 
causes a communication with the tube, which enters the ball 
=z right angles. A similar, but smaller brass ball, may be 
served above, with perforations similar to: as in the lar- 
oe ball, and a tube: in like: manner entering» it: Jaterally. 
This ball terminates in'a eae screw below, as: sect as above ; 
is ae 
and. thus determines: the degree of compression conti to a 
in the t th 
the, ball;.a small screw. may be observed;  witlr a milled: 
head It is connected with a small:tube which passes through: 
cork in, the nut;.andireaches nearly to: the external orifiee; 
ratty which, the flame. is: represented: as This 
tube jis, for. the most. part; of brass, but; pa, endj. ter- 
minates, in ai tube-of lnto-the female screw of the’ 
larger ball, a perforated. cylindercok brass, (c) with a corres- 
