BOILER No. 11. 



97 



BOILER No. 11, LONGITUDINAL SP:CTION. 

 Dimensions of Boiler No. 11. 



Diameter of shell, 48 in. 



Length between heads and length of tubes, . . . 15 ft. 



Number of tubes 3 inches outside diameter, .... 49 



Area of heating surface, 639 sq. ft. 



Area of grate surface, 18 sq. ft. 



Area through tubes, ......... 2 sq. ft. 



Ratio of heating surface to grate surface, . . . . 35.5 to 1 



Ratio of grate to tube area, . . . . . . . 8.9 to 1 



Results of Tests. Boiler No. 11. 



