146 



ON THE SETTING OP STEAM BOILERS. 



spaces, tlio furnace door, the briclpje, tlio admission of air 

 above the fuel or behind the bridge, its exact regulation to 

 the requirements of the fuel, and many other such points, 

 have received their full amount of attention, and in some 

 cases have been regarded and proclaimed by their enthusi- 

 astic advocates as the best and only remedy for defective 

 steam generation. But, with this one exception, I am 

 not aware that any improvements of any consequence 

 have been made in the setting and flues of Cornish and 

 Ijancashire boilers since the day when the existing type 

 was first introduced ; and I shall bo glad if the reading of 

 this paper, to which you have been good enough to listen, 

 may serve to attract more attention to the proper propor- 

 tion and construction of the flues and chimneys, without 

 which other improvements, however good they may be, will 

 fall short of accomplishing that for which tlioy wore 

 designed. 



