BOILER No. 54. 



Boiler No. 54 is a 

 vertical tubular boiler 

 arranged and set in 

 the manner shown in 

 the following cut. The 

 style of setting differs 

 from the ordinary prac- 

 tice, the sides of the 

 furnace being provided 

 with perforated tiles, 

 through which air is 

 admitted above the fuel. 

 The air is first passed up 

 and down through ducts 

 in the walls, before it 

 is discharged into the 

 furnace. 



BOILER No. 54, VERTICAL ELEVATION. 

 Dimensions of Boiler No. 54. 



Diameter of main shell, 90 in. 



Diameter of drum and water leg, . . . . . 29 in. 



Length of main shell and tubes, . . . . . . 9 ft. 9 in. 



Number of tubes, 2 inches outside diameter, . . . 248 



Area of water-heating surface, 93G sq. ft. 



Area of steam-heating surface, ...... 517 sq. ft. 



Area of total heating surface, 1,453 sq. ft. 



Area of grate surface, . . . . . . . .45.6 sq. ft. 



Area through tubes, ......... 4.1 sq. ft. 



Area through flue, . 2.8 sq. ft. 



Height of chimney, . . 125 ft. , 



Width of air spaces and metal bars in grates, ... 1-2 in. 



