TENSILE STRENGTH OF BOILER PLATE. 



407 



ingly, and the temperature registered in the Tables was observed imme- 

 diately after the bar had given way. 



Experiments to ascertain the Influence of Temperature on the 

 Tensile Strength of Boiler Plate. 



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

 Boiler plate; sectional area =2*02 X '34 ="6868 sq. in. 



The temperature in this experiment was reduced to zero by a mixture of 

 pounded ice and salt, carefully placed round the plate in order to secure the 

 same temperature in the metal as in the bath. 



Table II. — Strain applied across the fibre. 

 Boiler plate; sectional area=2"5 X'313="7825 sq. in. 



The experiments in the above and No. III. Table were conducted at the 

 temperature of the atmosphere. Both specimens indicated a hard brittle 

 iron, the interior laminations having somewhat the appearance of cast iron, 

 with a fracture widely different from that exhibited when torn asunder in the 

 direction of the fibre. 



Table III. — Strain applied across the fibre. 

 Boiler plate ; sectional area =2'0x •32=*64 sq. in. 



