BOILEE No. 43. 



167 



The tests on Boiler No. 43 embrace a series made to deter- 

 mine the relative economy of different kinds of coal. The 

 best evaporative result was obtained with George's Creek 

 Cumberland coal, this being 10.26 pounds of water from and 

 at 212 degrees per pound of coal. Compared with the other 

 results this is 17 per cent, better than that obtained with 

 anthracite coal, 19 per cent, better than that given by the 

 mixed coal, and 25 per cent, better than that given by 

 the Nova Scotia culm. Based on the cost of fuel required to 

 produce one day's supply of steam, say 30,000 pounds from and 

 at 212 degrees, using the prices of coal which ruled at the 

 time of the tests, the various results are as follows : 



From these figures it is seen that the best result in point of 

 cost of fuel was obtained with the mixed fuel, and this is 

 represented by an expenditure of $6.31 per day. Comparing 

 the best grades of coal which were tested, viz : the Anthracite 

 and Cumberland, it appears that the highest priced coal per 

 ton, that is, the Cumberland, owing to its better evaporative 

 performance, was in reality the cheapest, the cost per day's 

 run being $0.27 less than that of anthracite coal. 



During Test No. 86 the air passages in the walls were closed 

 and no air entered the furnace above the fuel except that 

 which found its way through cracks in the setting, and through 

 the registers in the fire door. 



During one day's run on Test No. 87, which was made with 

 Cumberland coal, the coal was wet after being weighed, the 

 amount of water used being 5 per cent, of the weight of the 

 coal. On the day when the coal was wet, the quantity of 

 water evaporated by the boiler with the same weight of dry 

 coal, was increased 3 per cent. 



