62 



REPORT — 1853. 



Table IV. 



Experiment 2nd. — To determine the ultimate Strength of the Flat Surfaces 

 of Locomotive Boilers when divided into squares of 16 inches area. 



In the above experiments, it will be observed that the weakest part of the 

 box was not in the copper, but in tlje iron plates, which gave way bj' strip- 

 ping or tearing asunder the threads or screws in part of the iron plate at the 

 end of the stay marked a, fig. 5. 



