274 Dr Fyfe on the Evaporative Power of Coal. 



In this trial, which lasted for 8£ hours, 4 lb. of coal being 

 supplied regularly each half hour, there were used in all 68 lb., 

 and 400 lb. of water were evaporated, thus giving 5.88 for 

 each pound of coal. 



Three trials were made in the same way with English coal, 

 due attention being paid to the supply of fuel to the furnace, so 

 as to secure the proper combustion, and as the quantity put in 

 at a time was small, the combustion was tolerably regular. I se- 

 lect one of the trials, with which the others very nearly agreed. 



