BOILER No. 37. 



153 



in. 

 ft. 



72 

 14 

 71 



,144 sq. ft 

 29.2 sq. ft 

 sq 



5.4 



ft. 



7 



60 

 3-8 

 24 



8 



sq. ft. 

 ft. 



n. 

 in. 

 in. 

 39.2 to 1 

 5.4 to 1 



Dimensions of Boiler No. 37. 

 Diameter of shell, 



Length between heads and length of tubes, . . 

 Number of tubes, 4 inches outside diameter, . . 

 Area of heating surface, ...... 



Area of grate surface, 



Area through tubes, . . . . . . . 



Area through flue, . 



Height of chimney, 



Width of air spaces and metal bars in graces, . 



Distance of grate to shell, 



Distiuce of curved bridge to shell,. . . . 



Ratio of heating surface to grate surface, . . 

 Ratio of grate surface to tube area, 



Results of Tests, Boiler No. 37. 



Test No. 78. 



Manner of start and stop, . . . . { ^^. Wltb P relimina ^ 



Kind of run, .......... Continuous. 



Duration, 



Coal consumed, dry ( including wood equivalent ), 



Percentage of ash, 



Water evaporated, ....... 



Coal per hour, 



Coal per hour per square foot of grate, . . . 



Water per hour, 



Water per hour per square foot of heating surface, 



Horse-power developed, 



Boiler pressure, ..... . . 



Temperature of feed-water, 



Temperature of escaping gases, .... 



Water per pound of coal, 



Water per pound of coal from and at 212 degrees, 



Water per pound of combustible from and at 212 degrees, 



The test on Boiler No. 37 is of interest in showing the per- 

 formance of Ohio lump coal in a horizontal tubular boiler. 

 There is a noticeably high temperature of the escaping gases, 

 this being 501 degrees, and it may be concluded that the boiler 

 was deficient in heating surface. If it had been arranged with 

 suitable proportions, it would doubtless have shown an evap- 

 oration of 10 pounds of water from and at 212 degrees per 

 pound of combustible, which is 16| per cent, below the best 

 figures obtained with Cumberland coal. The coal here used, 

 like that on Test No. 71, is what is called " free-burnin: " 



