210 BOILEE TESTS. 



Results of Test, Boiler No. 60. 



Test No. 123. 



Manner of start and stop, Thin lire. 



Kind of run, . . Ordinary. 



Duration, 10.3 hrs. 



Coal consumed, dry (including wood equivalent), . 7,588 Ibs. 



Percentage of ash, 7.7 per cent. 



Water evaporated, 81,730 Ibs. 



Coal per hour, 739.3 Ibs. 



Coal per hour per square foot of grate, .... 13.08 Ibs. 



Water per hour, 7,962.8 Ibs. 



Water per hour per square foot of water-heating surface, 3.2 Ibs. 



Horse-power developed, . . . . ' . . . 243.1 H. P. 



Boiler pressure, ........ 46.4 Ibs. 



Temperature of feed-water, 186 deg. 



Temperature of escaping gases, 427 deg. 



Number of degrees of superheating, , 18 deg. 



Draught suction, 0.28 in. 



Water per pound of coal, 10.77 Ibs. 



Water per pound of coal from and at 212 degrees, . 11.34 Ibs. 



Water per pound of combustible from and at 212 degrees, 12.29 Ibs. 



The test on Boiler No. 60 shows the performance of a well 

 proportioned vertical tubular boiler, using Cumberland bitum- 

 inous coal. The conditions, both in the matter of proportions 

 of the boiler, and the character of the work done during the 

 test, are favorable to economy. The proportion of water- 

 heating surface to grate surface is as large as good practice 

 in horizontal boilers requires ; there is a considerable amount 

 of steam-heating surface ; there is a minimum chance for 

 external radiation ; there are no avenues for the entrance of 

 air except those provided in the fire-door ; and during the test 

 the rate of coal consumption was sufficient to secure excellent 

 combustion. 



The result of the test bears out the expectations which these 

 favorable conditions justify. If an allowance be made for the 

 superheated condition of the steam, the equivalent evaporation 

 per pound of combustible from and at 212 degrees becomes 

 12.40 pounds, and the high character of the economy thus 

 shown needs no comment. 



