MR J. MUIR ON THK ICKCOVERY OF IRON FROM OVERSTRAIN. 



31 



occurred during the first 5 minutes is shown to have been considerable ; for the next 

 15 hours it was perhaps not so great as might have been expected. This creeping 

 \\rnt tn the production of permanent set. Curve No. 4, Diagram IX., was obtained 



Diagram No. IX. (Temperature effects.) 



Settle-- I unit 



Curve No. 1. Primary test. 



2. After 12 hours at 100' C. 



3. 15 minutes after No. 2. 



4. After load removed from 3. 

 S(>ccimcii now at 45 C., see table, p. 32. 

 Curve No. 5. After 3 minutes at 60 C. 



Extensions - diminished as explained on page if. 



of *n inch. 



Curve No. 6. After 4 minutes at 70 C. 



6'. Immediately after No. 6. 



7. After 4 minutes at 70* C. 



8.- 3 100 C. 



9. process A, diagram X. 



ii ii I". .. D, ,, \ 



immediately after the removal of the load from the test illustrated by Curve No. 3, 

 and t hen the specimen was kept at 45 C. for 5 minutes, and afterwards for 15 minutes. 

 The effects produced which were slight are shown in the following table. The 



