200 



BOILER TEST IS. 



ffl 



BOILER No. 56, VERTICAL ELEVATION. 



Boiler No. 56 is a ver- 

 tical tubular boiler, con- 

 sisting of six vertical 

 shells filled with tubes, 

 surrounding and com- 

 municating with a central 

 shell, as shown in the 

 following cut. 



The whole is enclosed 

 in a circular wall which 

 forms the setting. The 

 flue space is separated 

 from the furnace space by 

 iron plates fitting around 

 the shells. This type of 

 boiler does not differ in 

 principle from the ordi- 

 nary vertical boiler, but 

 it differs somewhat in the 

 proportions. It has a 

 low proportion of water- 

 heating surface to grate 

 surface, namely, 15.5 to 



1, and a correspondingly high proportion of steam-heating 

 surface. The tube area is small. 



Eesults of Test, Boiler No. 56. 



Duration, .... 



Coal consumed, . . . 



Percentage of ash, 



Water evaporated, 



Coal per hour, . 



Coal per hour per square f o 



Water per hour, 



Water per hour per square : 



Horse-power developed, . 



Boiler-pressure, 



Temperature of feed-water 



Temperature of escaping gases 



Number of degrees of superheating 



