BOILEE No. 36. 



149 



Kind of boiler, . 

 Number used, . 

 Horse-power ( basis 12 sq. ft. ), . 

 Age, 



Boiler No. 36. 



Horizontal tubular, detatched furnace. 



One. 



Two hundred and seventy. 



Two months. 



Boiler No. 36 is a horizontal 

 tubular boiler arranged with a 



n 



the 



manner shown in longitu- 

 followin 



detached furnace 

 eral 



dinal section in the 

 cut. The position of the fur- 

 nace with reference to the 

 boiler is precisely that of the 

 fire-box of a locomotive boiler. 

 After the products of combus- 

 tion have passed forward 

 through the tubes, they return 

 beneath the shell and enter an 

 underground flue leading to 

 the chimney. Direct radiation 

 of heat from the coal in the 

 furnace to the tube sheet is 

 prevented by means of a brick 

 arch which overhangs the 

 grate. This boiler has a large 

 shell, long tubes, and a large 

 extent of heating surface com- 

 pared with grate surface. 



Dimensions of 

 Diameter of shell, ...... 



Length between heads and length of tubes, . 

 Number of tubes 3 inches outside diameter, 

 Area of heating surface, .... 



Area of grate surface, 



Area through tubes, ..... 



Araa through flue, . 



Height of chimney, ..... 



Width of air spaces and metal bars in grates 

 Ratio of heating surface to grat-j surface, . 

 Ratio of grate surface to tube area, 



Boiler No. 36. 



96 



20 



200 



3,242 



56 



8.5 

 9.7 

 98 



in. 

 ft. 



sq. ft. 

 sq. ft. 

 sq. ft. 

 sq. ft. 

 ft. 



Air 3-8 in, 



metal 1-2 in. 



57.9 to 1 



6.7 to 1 



