82 Mr. J. P. Joule on the Effects of Magnetism. 



The next experiment was with a bar of well-annealed iron, 

 one yard long and about half an inch square. Its weight was 

 45i^ oz. I have introduced an additional column into the table, 

 in order to reduce the action on the magnetic balance to the 

 section of the former bars, the weight of each of which was 

 8 oz. 



Experiment 3. 



