BOILER No. 53. 



191 



Dimensions of Boiler No. do. 



Diameter of shell, 



Height of shell and length of tubes, .... 

 Number of tubes, 2 1-2 inches outside diameter, 



Diameter of brick furnace, 



Area of water-heating surface, 



Area of steam-heating surface, 



Area of grate surface, ....... 



Area through tubes, 



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



Area through stack, 



Height of stack, 



Distance from grate to tube sheet, 



Ratio of water-heating surface to grate surface, 

 Ratio of steam-heating surface to grate surface, 

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



Results of Tests, Boiler No. 53. 



