100 



BOILEB TESTS. 



BOILER No. 12, LONGITUDINAL SECTION. 



Dimensions of Boiler No. 12. 

 Diameter of shell, 

 Length of main shell bet\v 

 Number of tubes three inc 

 Length of 52 tubes, . 

 Length of 55 tubes, 

 Area of heating surface, 

 Area of grate surface, 

 Least area for draught thr 

 Area through chimney, 

 Height of chimney, 

 Width of air spaces and ir 

 Distance of grat > to shell, 

 Distance of bridge wall to shell, 

 Ratio of heating surface to 

 Ratio of grate to tube area, 



