680 SUMMARY OF CURRENT RESEARCHES 



means of a thermocouple, and required 16 to 20 hours. The volume of 

 water melted was measured and corrected. The following values were 

 obtained : — Specific heat of molten cast-iron of eutectic composition in 

 the ranges 1175° to 1275° C. = 0-3136 ; 1275° to 1375° C. =0*3216 ; 

 latent heat of solidification of 1 gram = 59 calories. 



Effect of Temperature upon the Magnetic Properties of Electro- 

 lytic Iron.* — E. M. Terry has determined the magnetic properties of 

 iron at temperatures between - 190° and 785° C. Burgess electrolytic 

 iron of remarkable purity was used, ■ 07 p.c. of hydrogen and " 012 p.c. 

 carbon being the principal impurities present. The specimens were ex- 

 amined microscopically after different treatments. The author finds that 

 ferromagnetism reappears on cooling at the same temperature (785° C.) 

 at which it disappears on heating. 



Arrivaut, G. — Melting-point Diagram of the Silicon-silver Alloys. 



Procts-verbaux des stances de la Socittt des Sciences physiques 

 et naturelles de Bordeaux, 1908-9, pp. 9-14 and 20 (1 fig.) 



See also this Journal, 1909, p. 264. 

 Bornemann, K. — Binary Metallic Alloys. 



[A continuation of the summary of published work. (See this Journal, 1909, 

 .P- 787.)] Metallurgie, vii. (1910) pp. 103-10 (25 figs.). 



Ducelliez, F. — Chemical Stndy of the Cobalt-bismuth Alloys. 



[No compound is formed, and cobalt and bismuth are only 

 miscible to a small extent in the molten state.] 



Procts-verbaux des stances de la Socittt des Sciences 

 physiques et naturelles de Bordeaux, 1908-9, 



pp. 21-4. 

 „ ,, Cobalt-copper Alloys. 



[No compounds were found.] 



Tom. cit., pp. 120-6 (1 fig.). 



„ ,, Electromotive Forces of Cobalt-bismuth Alloys. 



Tom. cit., pp. 126-9 (1 fig.). 

 „ „ Cobalt-lead AUoys. Tom. cit., pp. 129-31.(1 fig.). 



,, „ Cobalt-antimony Alloys. Tom. cit., pp. 131-4 (1 fig.). 



„ „ Cobalt-tin Compounds. Tom. cit., pp. 134-6 (1 fig.). 



Friedrich, K. — Technical Thermal Analysis of Metallurgical Processes. 



Metallurgie, vii. (1910; pp. 33-9. 

 Guillet, L. — Cementation. 



[The author makes some theoretical and practical observations. A mixture 

 of wood-charcoal (60 p.c.) and barium carbonate is recommended as a 

 cementation agent. For practical purposes a temperature of at least 

 850° C. is necessary.] Rev. Metallurgie, vii. (1910) pp. 496-500. 



Rengade, E. — Theoretical Form of Cooling Curves of Binary Mixtures. 



[The subject is treated mathematically.] Tom. cit., pp. 89-97 (5 figs.). 



Vigouroux, E.— Electromotive Forces of Nickel-copper Alloys. 

 [No evidence of the existence of a compound was obtained.] 



Proce's-verbaux des stances de la Socittt des Sciences physiques et 

 naturelles de Bordeaux, 1908-9, pp. 114-19 (1 fig.). 



* Physical Review, xxx. (1910) pp. 133-60 (18 figs.). 



