28-Jr Peirce — Permeabilities and Reluctivities for Steel. 



Table I. — Bessemer Half -Inch Bod in Long Solenoid. 



H 



B 





H 



B 



















0-5 



115 







10 



5 10650 



1-0 



280 







11 



10890 



1-5 



465 







15 



12400 



2-0 



730 







20 



13360 



2-5 



1180 







30 



14480 



3-0 



1935 







40 



15200 



3-5 



2800 







50 



15720 



4-0 



3760 







60 



16120 



4-5 



4830 







70 



16460 



5-0 



5700 







80 



16750 



5-5 



6410 







90 



17000 



6*0 



7060 







100 



17220 



6-5 



7650 







120 



17640 



7-0 



8130 







160 



18240 



7'5 



8600 







200 



18800 



8-0 



9040 







240 



19200 



8-5 



9420 







270 



19620 



9-0 



9760 







300 



19800 



9-5 



10070 







350 



20240 



10-0 



10390 







400 



20660 



Table II.— 



Half-Inch Bessemer Bo 



i in Massive Yoke. 





(Free 



length about 80 mm ) 



H 





B 





I 



400 





20660 





1613 



500 





21250 





1652 



600 





21660 





1676 



707 





21900 





1686 



800 





22020 





1688 



1000 





22230 





1689 



1208 





22470 





1692 



1500 





22770 





1692 



2090 





23550 





1692 



2590 





23 



860 





1693 



Numerous observations were made for values of H lying 

 between 350 and 1600 and these were used to draw a curve 

 from which some of the mimbers given above were taken. 

 Above 1 600, I had only two observations and the results of 

 these for H— 2090 and iZ=2590 appear at the end of the 

 table. The observations for H—107 and iZ"— 1208 were the 

 only ones in these neighborhoods and are given as they stand. 

 The value of I for iZ=2590 happened to come out 1693, but 

 a study of the observations shows that this number is really 

 uncertain by about two units in the last place, for B is not 

 determined in the fourth significant place. 



