FlCURK 5. 



Curves Gy, Gs, and P were obtained from tbo throttling data of 

 Griudley, Griesslnann, and Ptako by tho method proposed in this 

 paper. The scale of each curve is that indicated along both mar- 

 gins of the figure; tho actual numerical values along each curve aro 

 not given. At [lie bottom of the figure IlcgnaiuYs observations are 

 plotted on the same sculo (curve R) for comparison. His numerical 

 values are indicated at the right. 



In the upper part of the figure the more reliable deterrai nations 

 of H have been pjotted together on the same scale, their numerical 

 values being indicated in the left-hand margin. The four curves below 

 aro represented in this main curve only by the means of the groups 

 into which their points have been divided. 



The meaning of tho symbols in the figure is as follows: 

 I RcgnauJl, • Dieterici. The small 



OGrindlev, ©Smith, circle at 100° 



© Griessniann, •©Griffiths, 1 is the observa- 



<D Peake, • • ilenning* tion of Joly. 



1 The smaller symbol is used for euch observations as seemed 

 doubtful to the observer himself. 



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