530 



Slow Stretch in Indiarubber, Glass, and Metal Wires. 



until a load large enough to cause a permanent extension is 

 used, but when such a load is used the stretching is no longer 

 a linear function of the logarithm of the time. As there 

 seems to be no simple connexion between the curves for 

 stretching for different loads, a series of curves for iron 

 wires is given on curve No. IV., and a series for steel on 



Curve No. IV. 



m "IDLY MO i ¥fOK£ M3, WA/5C SECS- 



1800 



1600 



1400 



1200 



5 1000 



800 

 600 

 400 

 200 



6 8 10 l£ 14 

 T/aie in Minutes. 



Curve No. V. 



84- 26 



/ 



/ 



















/ 

























































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/ 













ee 







i 1 



t 



/ 





^^ 















€-*-** 



~-^ 



^ 







£ 









€H 



C 12 16 



Time in minutes. 



eo 



24 



28 



32 



40 



curve No. V. Opposite each curve is given the load per 

 sq. cm. used in the particular stretching. It will be seen at 



