506 Of Chimney Fireplaces. 



to registers, they not only are quite unnecessary where 

 the throat of a chimney is properly constructed, and of 

 proper dimensions, but in that case would do much 

 harm. If they act at all, it must be by opposing their 

 flat surfaces to the current of rising smoke in a manner 

 which cannot fail to embarrass and impede its motion. 

 But we have shown that the passage of the smoke 

 through the throat of a chimney ought to be facilitated 

 as much as possible, in order that it may be enabled to 

 pass by a small aperture. 



Register stoves have often been found to be of use; 

 but it is because, the great fault of all fireplaces con- 

 structed upon the common principles being the enor- 

 mous dimensions of the throat of the chimney, this 

 fault has been in some measure corrected by them; but 

 I will venture to affirm that there never was a fireplace 

 so corrected that would not have been much more im- 

 proved, and with infinitely less expense, by the altera- 

 tions here recommended, and which will be more par- 

 ticularly explained in the next chapter. 



CHAPTER II. 



Practical Directions designed for the Use of Workmen, show- 

 ing how they are to -proceed in making the Alterations 

 necessary to improve Chimney Fireplaces, and effectually to 

 cure smoking Chimneys. 



ALL chimney fireplaces, without exception, whether 

 they are designed for burning wood or coals, and 

 even those which do not smoke, as well as those which 

 do, may be greatly improved by making the alterations 



