BOILER No. 66. 



221 



degrees. The evaporation was 8.48 pounds of water per 

 pound of coal, and 11.08 pounds of water from and at 212 

 degrees per pound of combustible. 



The temperature of the escaping gases was obtained at a 

 point between the flue heater and the chimney. The heater 

 added 18 degrees to the temperature of the water on Test 

 No. 130, that on entering the heater being 126.8 degrees. 



Boiler No. 66. 



Kind of boiler, .... 

 Number used, ..... 

 Horse power ( basis 12 square feet), 

 Kind of coal, . ... 



Age, ...... 



Water tube. 



One. 



One hundred. 



Anthracite Lehigh, broken. 



Six months. 



Boiler No. 66 is a water tube boiler, having the general 

 features shown in longitudinal section in the following cut. 



BOILER No. 66, LONGITUDINAL SECTION. 



Dimensions of Boiler No. 66. 



Number of tubes, 

 Length of tubes. 

 Diameter of drum, 

 Mean length of drum, 

 Area of heating surface, 

 Area of grate surface, 



. 54 

 . 18 

 . 36 

 17 ft. 6 

 1,196 



ft. 

 in. 

 in 

 sq. ft. 



28.7 sq. ft. 



