214 Effects of Heat modified by Compression. 



citic gravities in the tabic, of the chalk, and of this result, 

 arc as 1*551 : 2--135 ; that is, as 1 to I'if, These conclu- 

 sions do not correspond very exactly ; bat the chalk em- 

 ployed in this experiment was not one of those employed in 

 determining average specific gravity in the table; and other 

 circunrstances may have contributed to produce irregularity. 

 Comparing this chalk with result second, we have 1*551: 

 '2'b'tb, so 1 : 1*66(72* 



No. II. 



Table contaimnig the Reduction of the Forces mentioned in 

 Chap. ni. to a common Standard. 



Explanation. 



Column I. contains the number of the experiment, as re- 

 I; rred to in the text. Column II. The bore of the barrel 

 u^d, in decimals of an inch. Column III. The absolute 

 force applied to the barrel, in hundred weights. Column IV. 

 The temperature in \Ved«e\vood's scale. Column V. The 

 depth or 3€cl at which a force of compression would be ex- 

 erted equal to that sustained "bv the carbonate in each ex- 

 periment, expressed in feet. Column VI. The same in 



miles. 



