412 Messrs. Kei Iokibe and Sukeaki Sakai: Effect of 



are also similar to that of pure iron ; but we observe a single 

 difference that while in the case of pure iron, above 100° C., 

 the logarithmic decrement always increases, that of steels 

 shows a small decrease above 200° C, the amount of this 



Fig. 12.— Steel (0-55% 0.). 



AXIO* 



140 7-4 



\ZQ 7-0 



IOO 66- 



80 6-2 



eo 5-8 



40 54 



20 3-0 



O 4-6 







Pig. 11 



— Pure iron. 







N 

 76 

 AXIO* 



<!0- 





















1 





h 















^ 



^v 





















N 



^ 







80 6-2 

 €>0 5-8 



40 5-4 

























i 



1 









































O 4-6 



\ 





































^sj 



X 















\ 















\ 















\ 



N 

 [ 





























\ 















\ 









IOO 200 3O0 400 500 600 70O 



NXIO"" 



7-a 



IOO 200 300 4O0 500 600 700 



Fig. 13.— Steel (0-9 % C). 



n : rigidity. 











































































r 





\ 

















\ 



N 



f 







J 



i 





> 



\ 



V 



■— - 



•++** 



y 









\ 



O IOO 200 300 400 500 OOO 700 80O 



Fig. 14.— Steel (1-3% C). 

 X : log. dec. 



diminution increasing with the content of carbon. This 

 anomaly is also attributed to the cementite transformation 

 above referred to, and also observable in the case of the 

 experiment made by Guye and S. Mintz. 



