114 



BOILER TESTS. 



Boiler No. 16 is of the ordinary horizontal return tubular 

 type, with a flush front, the setting of which is shown in 

 longitudinal section in the cut. This boiler was one of a large 

 battery, and during the progress of the tests the boiler on each 

 side was in daily use. 



BOILER No. 16, LONGITUDINAL SECTION. 



Dimensions of Boiler No. 16. 

 Diameter of shell, ....... 



Length between heads and length of tubes, . 

 Number of tubes three inches outside diameter, . 

 Area of heating surface, ..... 



Area of grate surface, 



Area through tubes, . . . . . 



Area through flue, 



Height of chimney, 



Width of air spaces and metal bars in grates, 



Distance of grate to shell, 



Distance of flat bridge to shell, .... 

 Ratio of heating surface to grate surface, . 

 Ratio of grate surface to tube area, 



in. 



ft. 



60 

 15 

 70 



900 sq. ft. 



26.7 sq. ft. 



2.9 sq. ft. 



3 sq. ft. 



120 



3-8 



20 

 6 



ft. 

 in. 

 in. 

 in. 



33.8 to 1 

 92. to 1 



