EXPERLMEXTAL RESEARCHES OX DRAWX STEEL. 
0 
Diagram IE 
Piano Steel Wire, 
The relation of residual magnetic intensity to dimension ratio. 
It was also shown, and it can be seen from the table and diagram, that a rise of 
temperature in the cyclic state increases the magnetic intensity, and a fall of 
temperature diminishes it in the case of a magnet of large dimension I'atio constructed 
of drawn steel of the kind supplied for pianofortes,"^^ an effect contrary to what is 
ordinarily observed. 
The results of these experiments, and of others whicli need not here Ije introduced, 
u})on a number of steels of different chemical composition, as well as the fact that 
stretching simj^ly does not produce any marked change in the temperature coefficient, 
strengthen the conjecture that the abnormal effect is due to repeated drawing. 
* Knitting needle and pinion wires do not yield this effect, as they are treated differently to music wire 
in the process of drawing. 
