178 



BOILER TESTS. 



Results of Tests, Boiler No. 48. 



Test No. 95. Test No. 96 



The tests on Boiler No. 48 were made to determine the rela- 

 tive economy of anthracite pea coal and gas house coke, and, 

 incidentally, the general economy of the boiler. The evapora- 

 tion of water per pound of coke is 8 per cent, less than the 

 evaporation per pound of coal, and this relation is also that of 

 the cost of fuel in the two cases, the price per pound being the 

 same. The effect of the deficiency of heating surface in this 

 boiler is seen in the exceedingly high temperature of the gases, 

 and the consequent low degree of economy. Comparing the 

 result of Test No. 96 made on this boiler with pea coal, with 

 Test No. 36 made on horizontal tubular boiler No. 15 with 

 similar fuel, it appears that the evaporation per pound of com- 

 bustible is 20.1 per cent, less than that obtained in the case of 

 the improved form of boiler. Comparing also Test No. 95 

 'nnade on this boiler when using coke, with No. 67 made on 

 tubular boiler No. 31 with the same kind of fuel, it appears 

 that the cylinder boiler gave an evaporation of 32 per cent, 

 less water per pound of combustible, than that obtained with 

 the tubular boiler. 



