DAVIS. — CERTAIN THERMAL PROPERTIES OF STEAM. 



277 



tion may have will be wholly unaffected by the necessary change in 



-"100- 



It is interesting to compare the self-consistency of this work, as 

 represented by the narrowness of the bands of plotted points, with 

 that of Regnault's observations, which are plotted at the bottom of 

 Figure 5. 18 His band is at least eight or ten times as wide as any of 



TABLE II. 

 Henning's Measurements of H. 



those above it. It should also be noticed that something evidently 

 happened to his apparatus at 178° C, and that allowing for this, his 

 band shows unmistakably the same curvature as those above it. The 

 observations above 178° C. were, as a matter of fact, the last he made, 

 and he speaks definitely of serious trouble with his apparatus at the 



18 The large circle at the boiling point, 100° C, represents the mean of 38 

 points, of which only the highest and lowest are plotted. 



