322 ECONOMY OF FUEL. 



Iron hold-fafts drove into the brick work, to which 

 the breaft work is fcrewed, is much preferable to the old 

 method of putting wooden plugs which always fhrink 

 with the drying of the mortar, and in a fhort time leave 

 the frontice piece in a fhackling condition ; but if fcrew- 

 ed to iron hold-fafts, are firm, and fuch parts as will be 

 neceffary to remove occafionally, in order to renew the 

 cords, may be taken down and replaced in a few mi- 

 nutes. 



The marble cheeks as ufual are to be fixed firm to the 

 brick v/ork, covering a part of the grooves, which are to 

 receive the Hiding-mantle, but the upper or crofs piece 

 of marble is detached from the arch, allowing the fliding- 

 mantlc to move behind it, but is fupported on the cheeks 

 at each end ; and a piece of hoop-iron, the length of the 

 marble, fcrewed to the wood v.'ork on the back part, will 

 fvrengthen and keep the marble in its proper place. 



The valve C made of flieet-iron, is placed about lo or 

 1 2 inches above the opening of the fire-place in the throat 

 of the chimney, and lilted to fliut clofe on the top of the 

 brick work, which fliould be left flat. The pivots f, f, 

 are on the inner front of the fire-place, and are received 

 by the eyes d, d, which are faftcncd into the brick work. 

 The reafon for hanging the valve to the front part of the 

 chimney fine in preference to the back, is, that the foot 

 which falls on the plate in fweeping the chimney, may 

 fall through between the front wall and the valve, when 

 opened. Befides there is more fafety in the efcape of 

 heat paflingup the flue of the chimney at the back than 

 in the front, for too often wood is placed in the brick 

 work by thoughtlefd workmen, to the great danger of 

 taking fire, f, is a rack, hinged on the under fide of the 

 valve at J] the lower or rack end to move freely in an 

 iron loop^, which is fixed in the jamb. The advantage 

 of this method, is, that the valve can be moved with 



expedition 



