28 



On the EXPANSIVE FORCE, &c. 



of time, and thrown to the diftance of 415 feet by this force ; 

 fo adling, the intenfity of the force will appear to be truly afto- 

 nifliing. 



2^A', Wb may hence form an eflimate of the quantity which 

 the water expands by freezing. For the longeft cylinder of ice 

 was obferved to be 8^ inches without the hole ; to this add i^, 

 the thicknefs of the metal, or length of the hole, and the 

 fum, or 10 inches, is the whole length of the cylinder of ice, 

 the diameter of which is i -J^ inches ; and hence its foUd con- 

 tent is i.7'XioX.78j4 cubic inches. 



But the diameter of the fpherical cavity, filled with water, 

 is 9t'o inches; and therefore 9.i^XfX.7854 is the content of 

 the water in cubic inches. 



Hence then the content of the water is to the increafe by 

 expanfion, as f of 9.1^ to 10 times 1.7*, or as 502.4 to 28.9, 

 or as 174 to 10. So that the water, in this inflance, expanded 

 in freezing, by a quantity which is between the 17th and i8th 



part of itfelf. 



C. H. 



VI. 



