212 



BOILER TESTS. 



Dimensions of Boiler No. 61. 



Number of sections 5x76, 380 



Area of total heating surface, ...... 443 sq. ft. 



Area of grate surface, ........ 16.29 sq. ft. 



Area through flue, . . . .97 sq. ft. 



Ratio total heating surface to grate surface, 

 Ratio of grate to flue, .... 

 Chimney height, . . . . 



Area of water-heating surface, square feet, 

 Area of steam-heating surface, square feet, 

 Ratio of water-heating surface to grate, 



Test No. 124. 

 321 

 122 

 19.7 to 1 



27.2 to 1 

 16.8 to 1 

 100 ft. 

 Test No. 125. 

 221 

 222 

 13.6 to 1 



Results of Tests, Boiler No. 61. 



Test No. 124. Test No. 125 



NOTE. The tests commenced with a banked fire, and ended 24 hours afterward 

 with the fire in practically the same condition. 



The special object of the tests on Boiler No. 61 was to 

 determine its performance as a superheating boiler with two 

 widely different amounts of superheating. The variation in 

 superheating was obtained by carrying the water at two 

 different heights, the two points being indicated in the cut. 

 On the first test the superheating amounted to 25 degrees, 

 while on the second test it amounted to 153 degrees. In spite 

 of the wide difference in the quality of the steam, the evapora- 

 tion per pound of combustible was the same in both cases. 



