138 Hydrostatic Blowpipe. 
ent, a pipe of about three inches, in.diame 
On one. ode a ‘small groo ee aphaie in the upper sur- 
back so, that when nailed, a. Gi passage may 
her, qn each side of the groove... This 
cates with a hole bored, vertically into 
ines of some disks of metal, to constitute a valve opening up- 
wards, In the bottom of the cask, there is another valve, open- 
ing upwards, A piston.rod, passing perpendicularly through 
the: pipe,, from. the handle (H.,).is. fastened near its lower end; to - 
a, shamnisp herical, mass. of lead (L.). The-portion, of the rod be- 
bes, proceeds through the centre. of the leather, which 
covers the cavity formed by the hollow cylinder ; also 
rough ae mass of lead like the first, which being forced 
up by a screw and nut, subjects the leather, between it and 
the upper Picsies hemisphere, toa pressure sufficient to ren- 
der the juncture air tight. From the partition, an eduction 
pipe is carried under the table, where it is fastened, by means 
of ascrew, toa cock which carries a blowpipe ; ; so attached 
by 2 small swivel ips as to be sie. gees into any direction 
which can be necessary. A suction pipe passes from the 
opening covered by the lower valve! under the bottom of the 
cask, and rises vertically, close to it on the outside—termina- 
ting in a gallows (g,) for the, pthichhtenn of any flexible tube 
which may be necessar: 
up, and will move in fe egree, the adhhoepheric pressure 
from the cavity beneath it; consequently, the air must enter 
through the lawer valyé,. to.restore the equilibrium. Wher 
the piston is eee the leather. being bulged in the oppo- 
site direction, ith -beneath it is diminished, and the air 
“O -  "Phis apartment being 
usly, j fall of water, a. portion. of this, fluid ssneeseee? 
ie. pipe, into the upper, apartment. -The.same. 
