BOILER NO. 1. 



Results of Tests. Boiler No. 1. 



69 



The object of the tests on Boiler No. 1, was principally to 

 determine the effect which the use of the superheater had upon 

 the economy of the boilers. Test No. 1 was made with the 

 steam from the two boilers passing through the superheating 

 pipes, and test No. 2 with the superheater shut off. The steam 

 was superheated on test No. 1 66 degrees, and a comparison 

 of the two evaporative results shows that this was attended by 

 a loss in evaporation of 8.76 8.28 = 0.48 lb., or 5.5 per cent. 



In the same series of tests to which these belong, the effect 

 of placing an auxiliary furnace beneath the superheating pipes, 

 using coal at the rate of 4 pounds per square foot per hour on 

 a grate having 7 square feet of surface, was to secure a super- 

 heating of 134 degrees, attended by a reduction of 9.2 per 

 cent, in the evaporative efficiency. In another experiment on 

 the same plant, a superheating of 163 degrees was attended by 

 a reduction of 10.2 per cent, in the evaporation per pound of 

 total fuel used. 



The same superheating pipes, placed over an independent 

 furnace and surmounted by a heater made of small pipes, pre- 

 senting an aggregate of 60 square feet of surface, were attached 



