BOILER No. 2,5. 131 



Boiler No. 25. 



Kind of boiler, ..... Horizontal return tubular. 



Number used, One. 



Horse-power (basis 12 square feet), . Eighty-eight. 



Kind of coal, ...... Anthracite White Ash broken. 



A"-e, ....... Six months. 



Boiler No. 25 consists of an ordinary horizontal tubular 

 boiler arranged in the general manner shown in the cut of 

 Boiler No. 10. The flue gases, instead of passing over the 

 top of the shell, as there represented, proceed directly from 

 the smoke arch to the chimney, and the top of the shell is 

 covered with brick. This boiler was one of a battery of two, 

 and the only one in use. 



Dimensions of Boiler No. 25. 



Diameter of shell, . 60 in. 



Length between heads and length of tubes, . . . . 16 ft. 



Number of tubes 3 inches outside diameter, .... 80 



Area of heating surface, 1,047 sq. ft. 



Area of grate surface, ....... 23.7 sq. ft. 



Area through tubes, 3.3 sq. ft. 



Area through flue, ......... 4 sq. ft. 



Height of chimney, 62 ft. 



Width of air spaces and metal bars in grates, . Air 5-8 in., metal 3-8 in. 



Distancs of grate to shell, 18 in. 



Distance of bridge to shell, 7 in. 



Ratio of heating surface to grate surface, . . . . 44.2 to 1. 



Ratio of grate surface to tube area, . . . . . 7.1 to 1. 



Results of Test, Boiler No. 2,5. 



Test No. 60. 

 Manner of start and stop and kind of run, .... Ordinary. 



Duration, ........... 10.5 hrs. 



Coal consumed ( including wood equivalent ), . . 2,351 Ibs. 



Percentage of ash, ......... 15.7 per cent. 



Water evaporated, 20,219 Ibs. 



Coal per hour, 223.9 Ibs. 



Coal per hour per square foot of grate, 9.4 Ibs. 



Water per hour, . . 1,925.6 Ibs. 



Water per hour per square foot of heating surface, . .1.8 Ibs. 



Hors;-power developed, 58.4 H. P. 



Boiler pressure, . . . . . . . . .60 Ibs. 



Temperature of feed-water, ...... 202 deg. 



Temperature of escaping gases, . . . . . 369 deg. 



Draught suction, ........ 0.11 in. 



