ON THE STRENGTH OF LOCOMOTIVE BOILERS. 



65 



Experiment II.— Iron Stay, fths of an inch in 

 diameter, screwed and riveted into a copper 

 plate fths of an inch thick. 



Experiment III. — Iron Stay, fths of an inch in 

 diameter, screwed and riveted into an iron plate 

 ■Iths of an inch thick. 



Experiment IV. — Copper Stay, fths of an inch 

 in diameter, screwed and riveted into a copper 

 plate fths of an inch thick. 



It will be observed, on comparing the results obtained from the above 

 experiments, that iron plates and iron stays are considerably stronger than 

 those made of copper. It may not be advisable to have the interior fire-box 

 made of iron, on account of its inferior conducting powers and its probable 



1853. F 



