204 



BOILEE TESTS. 



distribution of the heating surface whereby it is made efficient 

 throughout its whole extent. 



Dimensions of Boiler No. 58. 



Diameter of shell 1\ feet high, ...... 



Diameter of fire-box, ........ 



Number of tubes in first section ( collective ) , 3 inches out- 

 side diameter, 



Number of tubes in second section (collective), 4 inches 

 outside diameter, 



Number of tubes in third section ( collective ) , 4J inches out- 

 side diameter, ......... 



Length of tubes in first and second sections, 



Length of tubes in third section, 



Diameter of dome, . . . . . . 



Height of dome, . 



Area of water-heating surface, 



Area of steam-heating surface, ...... 



Area of total heating surface 



Area of grate surface, ........ 



Area through flue, ......... 



Width of air spaces and metal bars in grates, 



Ratio of water-heating surface to grate surface, 



Ratio of steam-heating surface to grate surface, 



Ratio of grate surface to smallest tube area, . 



Air 1-2 in 



8 ft. 

 6.5 ft. 



280 

 76 



76 



5 ft. 

 7.5 ft. 



6 ft. 

 7.5 ft. 



2,273 sq. ft. 

 263 sq. ft. 

 2,536 sq. ft. 

 64.8 sq. ft. 

 12 sq. ft. 

 , metal 3-8 in. 

 35.1 to 1 

 4 to 1 

 12.1 to 1 



Results of Test, Boiler No. 58. 



Manner of start and stop and kind of run, . . ... 



Duration, .......... 11 



Coal consumed, dry ( including wood equivalent ), . 7,682 



Percentage of ash, 9 



Water evaporated, 72,207 



Coal per hour, ......... 668 



Coal per hour per square foot of- grate, .... 10 



Water per hour, 6,278 



Water per hour per square foot of water-heating surface, . 2 

 Horse-power developed, ....... 213 



Boiler pressure, . . ... ' . . . . . . 76 



Temperature of feed-water, . . . . . . 66 



Temperature of escaping gases 423 



Water per pound of coal, 9 



Water per pound of combustible from and at 212 degrees, 11 

 Water per pound of coal from and at 212 degrees, . 12 



Test No. 120. 



Ordinary. 



5 hrs. 



Ibs. 



3 per cent. 

 Ibs. 

 Ibs. 

 Ibs. 

 Ibs. 

 Ibs. 

 H. P. 

 Ibs. 

 deg. 

 deg. 

 Ibs. 

 Ibs. 

 Ibs. 



The test on Boiler No. 58 exhibits the performance of a 

 vertical tubular boiler, so planned as to overcome the losses 

 that attend the work of vertical boilers as ordinarily set in 



