14G BOILER TESTS. 



Water evaporated, .20,395 Ibs. 



Coal per hour, 296 Ibs. 



Coal per hour per square foot of grate, .... 12.3 Ibs. 



Water per hour, 2,357.7 Ibs. 



Water per hour per square foot of heating surface, . 3 Ibs. 



Horse-power developed, , 79.7 H. P. 



Boiler pressure, ........ 77 Ibs. 



Temperature of feed-water, ...... 86 deg. 



Temperature of escaping gases, . . . . . 572 deg. 



Water per pound of coal, 7.69 Ibs. 



Water per pound of coal from and at 212 degrees, . 9.27 Ibs. 



Water per pound of combustible from and at 212 degrees 10.00 Ibs. 



The test on Boiler No. 34 shows the performance of a hori- 

 zontal tubular boiler, using Wallston bituminous coal. This 

 fuel is a " free-burning " coal, similar in general characteristics 

 to that known as Pittsburg coal. Judging from the high tem- 

 perature of the escaping gases, which was 572 degrees, 

 the area of the heating surface does not seem to have been 

 sufficient to attain the best results from this class of fuel. If 

 the loss from the high temperature be measured by the effect 

 which a flue heater would produce on the economy under these 

 circumstances, this may be assumed to represent a loss of at 

 least 10 per cent. The performance with Wallston coal, under 

 favorable conditions, would thus be an evaporation of about 

 11 pounds of water from and at 212 degrees per pound of 

 combustible. This is about 10 per cent, below the results of 

 good practice for Cumberland bituminous coal. 



Boiler No. 35. 

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



Number used, Three. 



Horse-power ( collective basis 12 sq. ft. ), Two hundred-and seventy-five. 

 Age, . . . . . . . Six years. 



Boiler No. 35 embraces a plant of three horizontal tubular 

 boilers, set in one battery of brick work, the general features 

 of which are shown in longitudinal section in the following 

 cut. 



