22S Mr. J. P. Joule on the Effects of Magnetism, 8)C. 



ing in it. A more powerful current was then passed, and the 

 observations repeated as before; and so on with still more 

 powerful currents. The fifth column of the table gives the 

 effect upon the magnetic balance in grains, abstraction being 

 made of the effect due to the coil itself, which had been pre- 

 viously carefully determined by experiment. 



Experiment 9. Pressure 82 lbs. 



In the following experiment the same bar was subjected 

 to a pressure of 480 lbs. It possessed — 0*5 of permanent 

 mamietism to begin with. 



