34 



Prof. J. Thomson on the 



[Dec. 11, 



formula for giving the pressure p of steam with water, and (E) as that 

 for giving the pressure p' for steam with ice. The following two Tables 

 show the pressures p and p' for temperatures, in each case, both below and 

 above the freezing-point, as calculated from these two formulae ; and they 

 show, also in each case, the consequent differences of pressure for 

 1 change of temperature at several different temperatures, or, what is 



the same, the values of C -j- and - or several temperatures slightly 

 above and slightly below the freezing-point. 



TABLE I. By Formula (D) ; Steam with Water. 



TABLE II. By Formula (E) ; Steam with Ice. 



