ON THE STRENGTH OF LOCOMOTIVE BOILERS. 



61 



To the flat boxes thus constructed, the same lever, valve, and weight were 

 attached as used in the previous experiments ; and having applied the pumps 

 of a hydraulic press, the following results were obtained : — 



Table III. 



Experiment \st. — To determine the ultimate Strength of the Flat Surfaces 

 of Locomotive Boilers when divided into squares of 25 inches area. 



The above experiments are at once conclusive as to the superior strength 

 of the flat surfaces of a locomotive fire-box, as compared with the top, or 

 even the cylindrical part of the boiler; but taking the next experiment, 

 where the stays are closer together, or where the areas of the spaces are only 

 16 instead of 25 square inches, we have an enormous resisting power; 

 a force much greater than anything that can possibly be attained, however 

 good the construction, in any other part of the boiler. 



