Appendix.] MODIFIED by COMPRESSION. 185 



EXPLANATION. 



Column 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 Wedgwood's fcale. Column V. The depth of fea at which 

 a force of compreflion would be exerted equal to that fuftained 

 by the carbonate in each experiment, exprefTed in feet. Co- 

 lumn VI. The fame in miles. Column VII. Comprefling force, 

 exprefTed in atmofpheres. 



Both Tables were computed feparately, by a friend, Mr J. 

 Jardine, and myfelf. 



The following data were employed. 



Area of a circle of which the diameter is unity, 0.785398. 



Weight of a cubic foot of diftilled water, according to Pro- 

 feflbr Robison, 998.74 ounces avoirdupois. 



Mean fpecific gravity of fea-water, according to Bladh, 

 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. 



