TENSILE STRENGTH OP BOILER PLATE. 



409 



Table VII. — Strain applied in the direction of the fibre. 

 Boiler plate ; sectional area =2*54< X "32 ="8 128 sq. inch. 



The last three experiments, at a mean temperature of 114°, indicate a near 

 approach to uniformity of strength, that broken across the fibre being the 

 strongest ; the very reverse of those fractured at 60°, the numbers being as 

 197 : 184, or as 44 : 41 nearly, showing a loss of about '007 per cent. It is 

 difficult to account for these changes and defects in the strengths of the 

 plates, as most of the specimens were cut from one plate, and all of them 

 were of the same manufacture. 



Table VIII. — Strain applied in the direction of the fibre. 

 Boiler plate ; sectional area =2-6 x -308 =-8008 sq. inch. 



212° 



30,300 

 31,980 



•15 



39,935 



= 17-828 tons. 



Broken in boiling water. This specimen did not break at the narrowest 

 part of its section, which shows a serious defect in the plate. 



Table IX. — Strain applied across the fibre. 

 Boiler plate ; sectional area =2-01 X '33 ='6633 sq. inch. 



In Table VIII., where the specimen was drawn in the direction of the 

 fibre, there appears to be some defect in the plate, as it gave way, not at the 

 smallest section, but at a wider part of the plate, with a force of only 



