and Electrical Resistance of Iron. 243- 



Table IX. [continued). 



Specimen B. 

 (Curves 11 and 12.) 

 After annealing at 840°. After annealing at 1150°. 



Tempera- 

 ture. 



°C. 

 764 

 746 

 710 

 648-5 

 567 

 467 

 360-5 

 2515 

 136 



24 



Maximum 

 Permea- 

 bility. 



7800 

 7090 

 6070 

 5610 

 4900 

 5190 

 5280 

 4940 

 4250 

 3980 



Correspond- 

 ing Field. 



H 



•50 

 58 

 72 

 93 

 •09 

 •18 

 13 

 •38 

 •09 

 •84 



Tempera- 



Maximum 



Correspond- 



ture. 



bility. 



ing Field. 



°C. 



^ 



H 



764-5 



14600 



•20 



748 



13400 



•25 



730 



11700 



■33 



695 



9430 



•43 



634 



6040 



•58 



554 



4240 



•99 



457 



5120 



•94 



352 



5050 



•96 



249 



4820 



119 



137-5 



5020 



1-36 



24 



4680 



148 



TABLE X. 



Variation of Magnetic Hysteresis with Temperature. 

 (See Curves 14, 15, and 16.) 

 (a) Cycle between constant Limits of Magnetizing Force. 

 Specimen A. Specimen B. 



Limits: H=±6-10. 

 After annealing at 1050°. 



Limits: H=±6"83. 

 Annealed at 840°. Annealed at 1150°. 



Tempera- 

 ture. 



Hysteresis in 



ergs per c.cm. 



per cycle. 



°C. 

 765 

 708 

 625 

 506 

 325 

 175 



21-5 



500 

 920 

 1345 

 2060 

 3090 

 4110 

 4570 



Tempera- 



Hysteresis in 



ergs per c.cm. 





per cycle. 



°c. 





764 



426 



746 



573 



710 



1010 



648-5 



1650 



567 



2180 



467 



2550 



3605 



3195 



251-5 



3700 



136 



4360 



24 



4700 



Tempera- 



Hysteresis in 



ergs per c.cm. 





per cycle. 



°0. 





7645 



120 



748 



328 



730 



426 



695 



797 



634 



1010 



554 



1345 



457 



2025 



352 



2565 



249 



3130 



1375 



3500 



24 



3660 



