348 _ On the Compressibility of Water. 
ment, which I call a piezometer, and which is represented 
in Plate XXXII, (PI. 3 of this No.) Fig. 1. The cylinder, A, 
was three inches diameter, and eighteen inches long. The 
end, B, was made water tight, by means of a plate, which was 
soldered firmly to it. At the other end, C, a cap was ma 
_ to screw on and off at serch being also made water-tight. 
The rod or plunger, D, which was five-sixteenths of an inch 
in diameter, was made to pass hates a tight stuffing box, E. 
On the rod, immediately above the stuffing box, was fixed a 
flexible ring, a. A cannon, Fig. 2, of a sufficient size to 
in the piezometer, was fixed vertically in the earth, 
the muzzle being left about eighteen inches above ground, 
and the touch-hole plugged tight. Atthe mouth, a strong 
cap, A, was firmly screwed on. In the center of. this cap, 
a small forcing pump, B, was tightly screwed, the aaa “ 
which was five-eighths of an inch in diameter. There w 
an aperture, C, in 1 the cap, to introduce a valve, for the jie 
pose of ascertaining the degree of pressure. ‘One pound 
nto et no! 
water, «ni addnions! water forced in until the cap showe 
signs ‘of leakage; the valve, at the same time, indicating a 
pressure of one hundred atmospheres. The piezometer was 
then taken out of the cannon, and the flexible ring found to 
be eight inches up the rod, evidently proving the rod to have 
been into the cylinder that distance, showing, also, a 
compression of about one per cent. (6) We have seen, by 
1 experiments, that, to be able to produce this degree 
of compression, three pecoats must be pum ped: into the 
present can exist in in the liquid tate, (as was the case in the exp eriments 
of Delue,) 1 there i is every reason that it possesses the physical - 
properties of a liquid, and has as ith ee, water with 
which it is beedorvid Aceord beer is oe ton found that water was nomen? 
Sate, (Oe (Prat de Pama, 13 i) od ‘a ponds water stoi 
