236 Mr. J. P. Joule 07i the Effects of Magnetism^ S)C. 



superior to that of the soft iron, when magnetized to the same 

 extent. It will also be remarked that the increase of tension 

 does not produce half the diminution of elongation which it 

 does in the case of the soft iron. 



Experiments laith Soft Steel Wire. 



The following experiments with soft steel wire were made 

 in precisely the same manner as those with soft iron wire, 

 already described. 



Experiment 20. Soft steel pillar, one foot long, a quarter 

 of an inch in diameter. Pressure 82 lbs. 



Experiment 21. Same soft steel pillar. Pressure 480 lbs. 

 Permanent magnetism to begin with — 2'0. 



