BOILER No. 9. 

 Results of Tests. Boiler No. 9. 



91 



The tests on Boiler No. 9 were made to determine the rela- 

 tive economy and 'capacity of this type of boiler with different 

 kinds of fuel. The results of the tests are chiefly interesting 

 in showing the quantity of power which can be obtained from 

 a boiler of the horizontal return tubular type under the differ- 

 ent conditions of the tests. The chimney gave a draught 

 corresponding to three-eights of an inch water pressure, and 

 the damper was carried wide open on all the tests, so as to 

 secure its full capacity. Moreover, the fires were well tended 

 so that they should do their maximum work, being frequently 

 broken up and sliced, not only when the bituminous coals were 

 burned, but also when anthracite coal was burned. Under 

 these conditions the developed power, when Cumberland coal 

 was used, was nearly two times the rated power; when 

 anthracite Lehigh was used it was nearly 50 per cent, larger, 



