214 



BOILER TESTS. 



the entrance of air into the furnace space. The plant is fitted 

 with a flue heater, located at the point shown in the cut. The 

 heater consists of a cluster of vertical cast-iron pipes arranged 

 in the same manner as that connected with Boiler No. 33. 



Dimensions of Boiler No, 62. 

 Area of heating surf ace ( below shields ), . . . .5,480 sq.ft. 



Area of grate surface, 259 sq. ft. 



Area through flue, ......... 18 sq. ft. 



Area through tubes, . . . . . . . . .22.5 sq. ft. 



Height of chimney, . . 110 ft. 



Width of air spaces and metal bars in grates, . . .3-8 in. 

 Ratio of heating surface below shields to grate surface, . 21.2 to 1 

 Ratio of total heating surface to grate surface, . . . 32.8 to 1 

 Ratio of grate surface to flue area, . .. . . . 11.5 to 1 



Area or heating surface in flue heater, 1,280 sq. ft. 



Results of Tests, Boiler No. 62. 



NOTE. The coal in Test No. 126 when fired contained 5.5 per cent, of moisture ;that 

 in No. 127 contained 3.6 per cent. 



