BOILER TESTS. 



:= 



the use of a fine 

 grade of coal, 

 necessitated the 

 employment of a 

 blower to aid the 

 draught, the air 

 being discharged 

 into the ash pits. 



> 1 1 1 The main flue 



BOILER No. 4, LONGITUDINAL SECTION. contains a coil of 



pipe having a total surface amounting to 300 square feet, 

 through which the feed water was passed before entering the 

 boiler. 



Dimensions of Boiler No. 4. 

 Diameter of each shell, . 

 Length between heads an 

 Number of tubes ( colled 

 Area of heating surface, 

 Area of grate surface, 

 Area through tubes ( at si 

 Area through chimney, . 

 Height of chimney, 

 Ratio of heating surface 

 Ratio of grate surface to 

 Ratio of grate surface to chimney area, 



Duration, 



Coal consumed, moist ( ii 



Proportion of bituminous 



Percentage of ash and waste coal, 



Water evaporated, . 



Coal per hour, . 



Coal per hour per square foot of grate, 



Water per hour, 



Water per hour per square f 



Horse-power developed, . 



Boiler pressure, 



Temperature of feed-water, 



Temperature of escaping gases 



Draught suction of chimney 



Draught pressure of fan, 



Water per pound of coal, 



