APPENDIX. ] MODIFIED by COMPRESSION. 185 
EXPLANATION. 
Cotumn I. contains the number of the experiment, as refer- 
red to in the text. Column II. The bore of the barrel ufed, in 
decimals of an inch. Column III. The abfolute force applied to 
the barrel, in hundred-weights. Column IV. The temperature, 
in WepcGwoop’s fcale. Column V. The depth of fea at which 
a force of compreffion would be exerted equal to that fuftained _ 
by the carbonate in each experiment, expreffed in feet. Co- 
lumn VI. The fame in miles. Column VII. Comprefling force, 
exprefled in atmofpheres. 
Boru Tables were computed feparately, by a friend, Mr J. 
JARDINE, and myfelf. 
XN 
Tue following data were employed. 
Area of a circle of which the diameter is unity, 0.785398. 
Weicut of a cubic foot of diftilled water, according to Pro- 
feffor RoBison, 998.74 ounces avoirdupois. 
MEAN fpecific gravity of fea-water, according to BLapu, 
1.0272. 
Mean heighth of the barometer at the level of the fea 
29-91196 Englifh inches, according to LapLace. 
SPECIFIC gravity of mercury, according to CAVENDIsH and 
BRISsON, 13.568. 
