1879.] Long-continued Stress on the Elasticity of Metals. 225 



Table I. — Quick Breaking of Iron Wire, "036 inch in diameter, at 

 various speeds. " Black Annealed Wire." 



Number ot 

 experiment. 



.Kate ot act ding 

 weight. 



-oreaKing weignt 

 in pounds. 



Per cent, of 

 elongation on 

 original length. 



1 



| lb. per minute. 



45 



25-4 



2 



1 ,, 5 minutes. 



45i 



25-9 



3 



„ , 4 5 „ 



45i 



24-9 



4 



» 4 „ 



44| 



24-6 



5 



„ 3 „ 



44i 



24 -9 



6 



» 3 „ 



45i 



29 -6 



7 



„ 5 » 



44i 



27 '8 



Table II.— Slow Breaking of Iron Wire, '036 inch, in diameter, at 

 various speeds. " Black Annealed Wire." 



Number of 

 experiment. 



1 



Hate of adding 

 weight. 



Breaking weight 

 in pounds. 



Per cent, of 

 elongation on 

 original length. 



1 



1 lb. per 24 hours 

 )} 



48 



7-58 



2 



48 



8-13 



3 





47 



7-05 



4 



35 



47 



6-51 



5 





47 



8-62 



6 



55 



47 



5-17 



7 



5) 



46 



5-50 



8 



f lb. per 24 hours 



49 



8-50 



9 



48i 



8-81 



10 



35 



46 



7-55 



11 



35 



46 



6'41 



12 



33 



m 



6-62 



13 



i lb. per 24 hours. 



48 



8-26 



*14 



50 



8-42 



15 



33 



49 



7-18 



* Towards the end of the experiment weights were not put on at regular intervals, 

 but much slower than | lb. per day. 



Table III. — Quick Breaking of Iron Wire, "036 inch in diameter, at 

 various speeds. " Bright Annealed Wire." 



Number of 

 experiment. 



Rate of adding 

 weight. 



Breaking weight 

 in pounds. 



Per cent, of 

 elongation on 

 original length. 



1 



1 lb. per 5 minutes 



44i 



28-5 



2 



33 5 „ 



44i 



27-0 



3 



33 * ^ 33 



441 



27-1 



