Hydrostatic Blowpipe. 137 
seat } ‘and in nice operations, the motion of his body is an in- 
‘convenience, if not a source of failure. Bellows of this kind 
cannot be used for supplying combustion with oxygen gas ; 
because, as this air is only to be obtained by a chemical pro- 
cess, it is very desirable to avoid any waste of it; and, as 
there is always a portion of air remaining in them, even when 
e boards are pressed as near to each other as the folding of 
the leather will permit, any small quantity of oxygen gas, 
which might be drawn into them, would be contaminated. 
*« Being sensible of the advantage which would result from 
the invention of a more perfect method of supplying the blow- 
pipe with oxygen gas or atmospheric air, I was induced to 
Explanation of the figure. 
The Hi drostatic Blowpipe consists of a cask, divided by 
a horizon hotikontal tal diaphragm, —— o apartments (DD:) From 
1 
VOL. I—NO. 1. 
