58 Scientifie Intelligence. 
A 
a the Heat y eee in Iron and Steel by Reversals of - 
Magnetization ; ; by Joun Trowpripner and WattTER N, Hi1.— 
The object of our investigation was to che whic the 
heat which is generally attributed to Rede magnetizing and 
are heated when gra are made the cores of electro-magnets, and 
are submitted to the effects of rapidly alternating currents, it was 
thought that ey pe exhibit differept degrees of heating, and 
V 4 
e called an electro-magnetic criterion of certain etaniey proper- 
ties of these metals. It is well known that chemical analyses o: 
steel and iron throw very “little light upon their physical pou 
ties, such as tenacity and “clasticity in genet ral. There is no sat 
machi 
method could be devised which de epened duets upon electrical — 
and magnetic phenomena, it would be a valuable aid to the 
metallurgist. 
The 
He st ae demagnetization. If the nee is due oe 
alternating induction currents in the mass of metal, there should 
[The pipers, given of the east pm is here o eS 
These results show that this method affords no criterion of the 
physical properties of iron and steel. The molecular structure of 
the various specimens employed was not sufficiently modified to 
enable us to determine any differences in molecular heating,—if 
