CHAP. II] 



MAGNETIC CIRCUIT WITH IRON 



21 



ing the results of tests on samples of iron in ring form, as in Fig. I. 1 

 The current in the exciting coil is adjusted to a certain value, and 

 the corresponding value of the flux in the iron ring is determined 

 by any of the known means, for instance, by a discharge through 



50 100 150 Scale "B" 



10 30 80 Scale "A" 



H^AMPERETURNS PER CENTIMETER 



900 

 40 



2 Magnetisation in tocl and iron 



and forging* 



r an experimental study of the magnet i.< nrvuit with iron and for 

 practical testing of the magnetic properties of steel and iron see Vol. 1, 

 Chapters 6 and 7, of the author's Experimental Electrical Engineering. 



