Peirce — Permeabilities and Reluctivities for Steel. 287 



Figures 6 and 7 show the reluctivity of this iron at differ- 

 ent excitations. 



Two other half-inch specimens of very pure Norway iron 

 turned from two-inch bars obtained from different sources 

 gave as maximum values of the magnetization vector (I) 1732 

 and 1738. These were in the condition in which they were 

 bought and had not been specially annealed. 



Table Yl.—Halj 



'-Inch Mod of Compressed Shafting in Ion 







Solenoid 









H 



B 





H 





B 















13- 





10400 



0-5 



70 







14- 





10690 



1-0 



155 







15- 





10970 



1-5 



290 







20* 





12300 



2'0 



490 







25' 





13260 



2-5 



800 







30- 





13950 



3*0 



1280 







40* 





15150 



3'5 



2010 







50' 





15850 



4-0 



2880 







• 60* 





16480 



4'5 



3210 







70- 





16950 



5-0 



4450 







80* 





17320 



5 5 



5120 







90- 





17640 



6-0 



5730 







100 





17900 



6-5 



6270 







120 





18200 



7-0 



6780 







140 





18560 



7-5 



7200 







160 





18800 



8-0 



7610 







180 





19080 



8*5 



8020 







200 





19320 



9-0 



8380 







240 





19700 



9-5 



8690 







280 





20000 



io- 



9010 







320 





20360 



ii- 



9540 







360 





20600 



12- 



10100 







400 





20820 



Table VII.— Short Piece 



of Half 



■Inch 



Compressed Shafting 





Magnetized in Massive 



Yoke. 







(Free 



length about 80 n,m ) 





H 





B 







I 



300 





20220 







1585 



370 





20630 







1612 



400 





20820 







1625 



500 





21200 







1647 



600 





21500 







1663 



700 





21670 







1669 



800 





21810 







1672 



1000 





22080 







1678 



1200 





22340 







1682 



1600 





22800 







1687 



1854 





23 



080 







1690 



