292 



DR E. G. COKER ON 



a small amount was thereby avoided. Each stress operation causing overstrain was 

 succeeded by a heating in water at 100° C. for fifteen minutes, and in all the bar 

 was stressed eight times. The readings obtained are given in columns X.-XVII. 

 in Table XIV., and are plotted in the ordinary manner, fig. 29, the curves being 

 spaced 100 units apart for convenience. As might be expected, the curves show a 

 general agreement with those obtained by Mum, having regard to the fact that the 

 stress is non-uniform. 



Table XIV. 



Column X. 



Column XI. 



Column XII. 



Column XIII. 



Torque in 

 inch lbs. 



Keadin 



?■ A 



Torque in 

 inch lbs. 



Reading 



A 



Torque in 

 inch lbs. 



Reading 



. A 



Torque in 

 inch lbs. 



Readin 



g- A 











385 











390 











389 











386 



75 



385 



385 



75 



390 



390 



75 



389 



387 



75 



386 



389 



150 



770 



388 



150 



780 



389 



150 



776 



389 



150 



775 



389 



225 



L15S 



387 



225 



1169 



389 



225 



1165 



389 



225 



1164 



388 



300 



1545 



389 



300 



1558 



388 



300 



1554 



387 



300 



1552 



389 



350 



1934 



392 



375 



1946 



391 



375 



1941 



389 



375 



1941 



389 



450 



2320 



389 



450 



2337 



390 



450 



2330 



388 



450 



2330 



392 



525 



2715 



395 



525 



2727 



388 



525 



2718 



389 



525 



2722 



388 



600 



3110 



400 



600 



3115 



392 



600 



3107 



389 



600 



3110 



389 



675 



3510 



404 



675 



3507 



390 



675 



3496 



386 



675 



3499 



394 



750 



3914 



426 



750 



3897 



394 



750 



3882 



391 



750 



3893 



402 



825 



4340 



463 



825 



4291 



410 



825 



4273 



398 



825 



4295 



402 



900 



4803 





900 



4701 



617 



900 



4671 



419 



900 



4697 



414 



930 



Went off scale 



975 



5318 





975 



5090 





975 



5111 















260 







303 







475 









990 



5578 





1025 



5393 





1050 



5586 











1015 



Went off scale 



1050 



Went off scale 



1080 



Went off scale 



