482 Mr. J. L. W. Grill on the Distribution of 



Specimen in an alternating field and observe the R. M. S. 

 ( \/niean square) difference of potential on the terminals of a 

 small search-coil wound over the specimen. 



Kir. 2. 



\ZOOQ 



9000 



6000 



3000 



6 9 •> \Z 15 18 



Distance from Centre of Specimen. 



From this he calculated the maximum induction at the 

 section where the coil was placed. By moving the coil along 

 the specimen the induction at different sections was determined. 



