BOILER No. 12. 

 Results of Tests. Boiler No. 12. 



101 



NOTE. The mixed fuel when fired contained 5 per cent, of moisture. 



The tests on Boiler No. 12 had for an object the determina- 

 tion of the general economy of this particular form of boiler, 

 and the relative economy produced by different kinds of fuel. 

 The tests were made with a wi 1-3 open damper and a constant 

 maximum draught. They were thus capacity tests as well as 

 economy tests. The results obtained on Tests No. 25 and No. 

 26, made with anthracite coal, compare favorably with the 

 best performance of horizontal tubular boilers. It is probable 

 that even better results would have been obtained, if, on these 

 tests, there had been no air admitted above the fuel. In point 

 of economy the particular arrangement of tubes adopted ap- 

 pears to have been advantageous. The low temperature of 



