408 



REPORT — 1856. 



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

 Boiler plate ; sectional area =1*99 X '32 ="6368 sq. in. 



In some former experiments on the tensile strength of wrought-iron plates*, 

 the strength of the specimens was rather more uniform, and there appeared 

 to be no difference between the strength of the plates when torn asunder in 

 the direction of the fibre, and the strength when the strain was applied across 

 it. Comparing Tables II. and III. with IV., we find the breaking weight in 

 the direction of the fibre is to that across it as 22*41 :18'67j or as 5:4 nearly; 

 but it is possible that this arises from inequality in the rolling of the two 

 specimens. 



Table V. — Strain applied across the fibre. 

 Boiler plate ; sectional area =1*99 X "33 sq. inch. 



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

 Boiler plate ; sectional area =2"0 X •34=*68 sq. inch. 



* Philosophical Transactions for 1850, p. 677, the results of which are alto quoted at 

 page 340. 



