180 M. G. E. Svedelius on the Changes in the Length and 



in magnitude with each heating*. In a rod of Bofors wire 

 containing 0'6 per cent, of carbon I noticed that the mag- 

 nitude of the expansion at D', after the rod had been heated 



«r 



* Mentioned by Prof. Barrett in Report for 1890, p. 2. On the other 

 hand, Herr Heim (in his work, p. 34) linds the anomalous change during- 

 cooling decreases with repeated heating- only in wrought iron, but not in 

 steel. 



