378 BURGESS AND waltenberg: melting points 



same temperature for minute particles on the strips as for con- 

 siderable quantities in crucibles of magnesia. 



Assuming the melting points of nickel to be 1452°, palladium 

 1549° and platinum 1755°, and the calibration curves of the 

 pyrometer lamps of the form log c = a + 6 log T, for the range 

 here studied, we have determined the melting points of Fe, Co, 

 Cr, Mn, V and Ti with the micropyrometer and of Ni, Co and 

 Fe in quantity in the electric furnace, all melts having been taken 

 in pure hydrogen and Fe also in vacuo. For Cr, Mn and V, 

 strictly pure materials were not available, and we can but esti- 

 mate the melting points of the pure elements. 



In the complete paper, the method is discussed more in detail 

 and photomicrographs are given showing characteristics of the 

 various melts. 



