BOILER No. 10. 93 



Boiler Xo. 10 is of the ordinary horizontal tubular type. 

 The manner in which it is set is shown in the following cut, 

 which is a longitudinal section. The top of the bridge wall is 

 curved upward, so as to conform to the curve of the shell, and 

 the space behind is filled and curved at the top in a similar 

 manner. The products of combustion on leaving the smoke 

 arch in front, pass through the flue space, over the top of the 

 shell, and thence to the chimney. The manner in which this 

 is arranged is similar to that shown in the cross section given 

 in connection with Boiler No. 3. This arrangement secures a 

 small amount of steam heating surface, though the position of 

 this surface is such as to be more or less inefficient, on account 

 of deposits of soot. 



BOILER No. 10, LONGITUDINAL SECTION. 



Dimensions of Boiler No. 10. 

 Diameter of each shell, ....... 



Length between heads and length of tubes, . . . 



Number of tubes 3 inches outside diameter, . 



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, 



Distance of grate to shell, 



Distance of curved bridge w r all to shell, .... 

 Ratio of water-heating surface to grate surface, . 

 Ratio of steam-heating surface to grate surface, . 

 Ratio of 2-rate to tube area, 



48 

 16 

 48 

 650 

 80 

 19.5 



2 



3-8 



24 



8 



33.5 

 4.1 

 9.7 



in. 

 ft. 



sq. 

 sq. 



sq. 

 sq. 

 in. 

 in. 

 in. 

 to 1 

 to 1 

 to 1 



