BOILER No. 49. 



179 



Boiler No. 49. 



Kind of boiler, .... 

 Number used, .... 

 Horse-power (basis 10 square feet). 

 Age, ...... 



Plain cylinder. 

 One. 



Thirty-nine. 

 Several years. 



Boiler No. 49 is a plain cylinder boiler, the general features 

 of which are shown in the cuts of Boiler No. 47. The pecu- 

 liarity of this type of boiler is the small proportion of heating 

 surface to grate surface, which here was 10.9 to 1. 

 Dimensions of Boiler No. 49. 



Diameter of shells, three in number, 30 in. 



Length of shells, 30 ft. 



Area of heating surface, 394 sq. ft. 



Area of grate surface, .... . . . .36.1 sq. ft. 



Area through flue, 5.4 sq. ft. 



Height of chimney, 120 ft. 



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



Distance of grate to shell, 17 in. 



Distance of flat bridge to shell, 4 in. 



Ratio of heating surface to grate surface, .... 10.9 to 1. 



Katio of grate surface to flue area, 6.6 to 1. 



Results of Tests, Boiler No. 49. 



