THK THERMODYNAMICAL PROPERTIES OF SUPERHEATED STF.AM 



23 



through a glass plate inch thick and of sectional area Til sq. inches, with a 

 difference of temperature of 50 F. on its faces, would be about 0'037 B.T.U. 

 IT minute, and taking the specific heat of the superheated steam as 0*5 and the 

 ipiantity of steam 1 ll>. in 12 minutes, the rise of temperature of the wiredrawn 

 strain is calculati-il t<> l>e nearly 0*9 F. As in actual experiments the difference of 

 temperature due to this transference of heat by conduction will l>e much less than 

 this, no attempt has been made to correct the actual results for these differences. 



SECTION XV. Reduction of the Observation*. 



The performance of any of the experiments here described will give a series of 

 relations between the pressure and temperature of the wiredrawn steam for a 

 particular initial condition of the steam as regards its pressure and temperature. If 

 now these results be plotted on a diagram with pressures for abscissae and tempera- 

 tures as ordinates, we get a series of points as shown in Diagram 5. On this 

 diagram the initial condition of the steam in any experiment is shown on the 



Diagram 5 



