Hydro-orygen Blowpipe. Al 
feception. 'The lever is supported by a universal joint upon the 
fulerum, C, so that by means of a sliding weight at one end, the 
platform and its appurtenances are counterpoised at the other. 
The platform is kept in a horizontal position by the cannon ball, 
supported in a sort of iron stirrup terminating in a ring, in which 
the ball is placed. Upon the platform is situated an iron pan 
with a handle, holding the brick, on a cavity in which as already 
mentioned, the metal is supported. The apparatus being duly 
prepared, and connected with the supply pipes, the hydrogen 1s 
first allowed to escape, and then the oxygen, until the ignition 
has attained apparently a maximum. ‘The accomplishment of 
this object may, of course, require the adjustment of either cock 
several times, especially where there is any decline in the pres- 
sure either of the one or the other gas in its appropriate reservoir. 
By means of the handles of the lever and of the pan, the ope- 
rator is enabled to bring the metal into the position most favora- 
ble for the influence of the heat, while his hands and face are 
sufficiently remote to render the process supportable. In fusing 
any quantity, not being more than four ounces, the platform may 
be dispensed with, the handle of the pan being held in one hand 
of the operator, while by the other, the cocks may be adjusted. 
When the blowpipe of fifteen jets, or any larger, may be em- 
ployed, and the platform is necessarily resorted to, the cocks must 
be adjusted by an assistant. 
"ig. 5 represents a cask made of boiler iron, three-sixteenths of 
an inch thick, so as to resist an enormous pressure. ‘The joints 
by gas from the bell. This process being continued till the iron 
cask is sufficiently supplied with gas, » shut 
Whenever the gas is wanted for the supply of the blowpipe, it 
1S only necessary to establish a communicati 
cock, B, and the upper gallows screw, fig. 3, of the cylinder, A, 
and to open the cock, F, so as to admit the water to press upon 
Szconp Serizs, Vol. IV, No. 10.—July, 1847. 6 
