BY COMPRESSIOSr. 313 



amounting to 86 degrees. Now, I find, that Wedgwood's gage Explanation of 



tapers in breadth, from 0.5 at zero of the scale, to 0.3 at the *''^ Ti''^^^ °^. 

 ^ ' , ^ ». specific gfavi- 



240tb degree. Hence, we have for one degree O.OOOS33. ties,&c, 

 Consequently, the width, at the 75th degree, amounts to 

 0.437525; and at the l6]st, to 0.365887. These numbers, 

 den©ling the linear measure, of the crude chalk, and of its 

 result under heat and compression, areas 100 to S3. 8 ; or, 

 in solid bulk, as 100 to 57.5. Computing the densities from 

 this source, they are as 1 to 1.73. The specific gravities in 

 the Table, of the chalk, and of this result, are as 1.551? 

 2.435 ; that is, as 1 to 1.57. These conclusions do not cor- 

 respond very exactly ; but the chalk employed in this experi- 

 mentj was not one of those em-ployed in determining average 

 specific gravity in the Table; and other circumstances may 

 have contributed to produce irregularity. Comparing this 

 chalk with result second, we have 1.551 : 2.-575 so 1 : 1.6602. 



No. II.— TABLE, 



CONTAINING THE REDUCTION OF THE F0KCE3 MEN- 

 TIONED IN CHAP. VII. TO A COMMON STANDARD. 



I. 



n. 



III. 



IV. 



V. 



VI. 



VII. 



Number 







Tempe- 









riment 

 refened 



Bore, in 



decimals 



of an 



Pressure 



in 

 hundred 



rature by 

 Wedg- 

 wood's 



Depth of 

 sea in 

 feet. 



Ditto in 



miles. 



Pressure, 

 expressed 

 in atmos- 



to in 

 Chap. 



inch. 



weights. 



pyrome- 

 ter. 





pheres. 



VII. 















1 



0.75 



3 



22 



1708.05 



0.3235 



51.87 



2 



0.75 



3 



25 



1708 05 



0.3235 



51.87 



3 



0.75 



10 



20 



5(S9o.52 



1.0783 



172.92 



4 



0.75 



10 



31 



5693.52 



1.0783 



172.92 



5 



0.75 



10 



41 



5693.52 



1.0783 



17292 



6 



0.75 



10 



51 



56.93.52 



1.0783 



172.92 



7 



0.75 



10 



— 



5693 52 



1.0783 



172.92 



8 



0.54 



2 



— 



2196.57 



0.4160 



66.71 



9 



0.54 



5 4 

 is.i 



— 



4393.14 



0.8320 



133.43 



— 



8896.12 



1.6848 



270.19 



10 



0.75 



3 



21 



1708.05 



0.3235 



51.87 



11 



0.75 



4 



25 



2277.41 



4313 



69.70 



12 



0.75 



5 



— 



2846.76 



0.5396 



86.46 



Vol. XIV,— Av^ust, 1806. 



Ss 



iLxpla- 



