Magnetic Permeability of various AUof/s of Iron. 



75 



2-8 microhms per c.c. is produced by a rise in the carbon from 0-028 to 0'14 per 

 cent. ; this would indicate an increase of 2-5 microhms in the specific resistance 

 for every tenth per cent, of carbon added in these low carbon steels. Tlie last six 



Per-De,njta,ffe of Ca^rhon, x /O. 

 Fig. 2. 



specimens in Series A show that an increased resistance of 3*0 microhms is pro- 

 duced by a rise in the carbon from 0-78 to 1-23 per cent. ; this gives an increase 

 in the specific resistance of 0*66 microhms for every tenth per cent, of carbon 



TEANS. HOT. DUB. SOC, N.S. VOL. VU., TAET IT. N 



