BOILER No. 13. 



103 



i 



in 



BOILER No. 13, LONGITUDINAL SECTION. 

 Dimensions of Boiler No. 13. 



Diameter of shell, 48 in. 



Length between heads and length of tubes, . . . 1G ft. 



Number of tubes three inches outside diameter, ... 48 



Area of heating surface, 609 sq. ft. 



Area of grate surface, . . . . . . . . . 19.9 sq. ft. 



Area through tubes, 2 sq. ft. 



Area through flue, ......... 1.9 sq. f 



Height of chimney, 77 ft. 



Width of air spaces and metal bars in grates, . Air 3-8 in., metal 5-8 i 



Distance of grate to shell, ....... 19 in. 



Distance of flat bridge wall to shell, . . . . . in. 



Ratio of heating surface to grate surface, .... 33.7 to 1 



Ratio of grate to tube area, . . . . . . . 10 to 1 



Results of Tests, Boiler No. 13. 



