BOILER TESTS. 



Dimensions of Boiler No. 2. 



Diameter of each shell, 



Length between heads and length of tubes, . 



Number of tubes ( collective ) 3 inches outside diameter, 



Area of heating surface, ....... 



Area of grate surface ( common to two boilers ) , . 

 Area through tubes, ........ 



Area through flue, 



Chimney height, ' . 



Distance of grate to shell, ...... 



Ratio of heating surface to grate, 



Ratio of grate to tube area, 



Ratio of grate to flue area, 



Results of Tests. Boiler No. 2. 



48 in. 



15 ft. 

 99 



1,235 sq. ft 

 40.5 sq. ft 



4.1 sq. ft. 



2.7 sq. ft. 

 130 ft. 

 20 in. 

 30.5 to 1 



9.9 to 1 

 15 to 1 



The principal object of the tests on Boiler No. 2, was to 

 show the effect produced by increasing the heating surface of 

 the boiler in the manner noted. This object was not fully 

 realized, because changes were made in the setting of the 

 boilers, in addition to the change in the amount of heating 

 surface. One result produced was to increase the percentage 

 of moisture in the steam. This was probably due to the dis- 

 charge of the feed water into the steam space. The increase 



