132 BOILER TESTS. 



Water per pound of coal, ...... 8.60 Ibs. 



Water per pound of coal from and at 212 degrees, . 8.94 Ibs. 



Water per pound of combustible from and at 212 degrees, . 10.61 Ibs. 



The test on Boiler No. 25 shows the performance of a well 

 proportioned boiler working under favorable conditions for 

 securing economy. There is an ample amount of heating sur- 

 face ; the quantity of power developed, although small com- 

 pared with the nominal capacity of the boiler, is sufficient to 

 secure a moderately high rate of combustion, and the tempera- 

 ture of the waste gases does not show much loss of heat to the 

 chimney ; yet the evaporation per pound of combustible from 

 and at 212 degrees, with a standard grade of anthracite coal, 

 is only 10.61 pounds. The only reason which can be assigned 

 for the unfavorable character of this result appears to be an 

 inferior quality of fuel, which may be inferred from the large 

 percentage of ash, this being 15.7 per cent. 



Boilers No. 26 and No. 27. 



Kind of boilers, Horizontal return tubular. 



Number used, each, Two. 



Horse-power ( collective ), each* (basis 12 



square feet ) , Two hundred and eighty. 



Kind of coal, Nova Scotia Culm. 



Age, each, Three months. 



Boilers No. 2 6 and No. 2 7 are of the ordinary horizontal tubu- 

 lar type, and each embraces a plant of two boilers set in one 

 battery of brick work. They are identical with respect to type, 

 arrangement of setting, and location with reference to the 

 chimney, in all respects except one : the side walls of the fur- 

 naces and the top of the bridge walls in Boiler No. 27 are pro- 

 vided with perforated tiles through which air is admitted to the 

 furnaces above the fuel, while Boiler No. 26 has no such pro- 

 vision. The two batteries of boilers are located at the 

 same distance from the chimney, one set being on one side of 

 the chimney, and one set on the other side, and a similar plan 

 is followed in each case in the arrangement of the flues. The 

 arrangement of the setting of the boilers is the same in general 

 features as that shown in the longitudinal section of Boiler 



