Brown — Permanent Steel Magnets. 

 Table II. 



315 



The results obtained are, perhaps, better shown by plotting in a curve 

 the values in column 1 of Table II. as abscissae, and the corresponding 

 values in column 3 as ordinates. We are thus enabled to fix on the most 

 effective length to make the magnet when we know the diameter, as shown 

 here in fig. 2. 



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