310 



Rankin and Merwin — 



TlIK BoiM'AKY (VUYKS. 



The boundary lines in fig. 1 represent the projection 

 upon the horizontal plane of the lines on the solid con- 

 centration-temperature diagram. In order to make clear 

 the way in which the temperature varies along these 



lines, we have made projections upon a vertical plane, 

 obtaining in this way the series of boundary curves repro- 

 duced in fig. 2, in which the numbers and letters used 

 correspond to those given in fig. 1. The ordinates 

 represent temperatures which were determined exper- 

 imentally. 



These temperatures which are ascertained by the 

 quenching method are contained in Table 14. The tem- 

 peratures at the ends of the boundary curves are given 

 later as quintuple and quadruple point temperatures. 



