Dimensions caused by Magnetization in Iron. 467 



fig. 5 (p. 468), for a specimen o£ the same kind of iron heated 

 directly in a flame after being wrapped in asbestos. Mr. Bidwell 

 has obtained a diminution of the maximum by annealing 



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MAGNETIC F/£LD //V C.G.S. 



Upper curves for specimens cut out in one direction. 

 Lower curves for specimens cut out at right angles to above. 



which would not be expected from the intimate relation which 

 undoubtedly exists between the change of length and the 

 magnetization-curves. The possibility that his specimen may 

 have been burned in annealing suggests itself. 



These curves (fig. 4) are also arranged to show the effect 

 of the direction in which the specimens were cut from the 

 original sheet. 



The apparatus to show the change of width consisted of a 

 strip of thin sheet-iron 5 x 36 cm., in the centre of which was 

 an arrangement for making the change of width operate a 

 lever, parallel to the specimen^ on the end of which rested 



