ECONOMY OF FUEL. 311 



fliding-mantle and valve, or damper, &c. will be found 

 the moft comfortable, fafe^ and econoviizing.^ 



Kxphnation of the Plate. 



Figure A is the fliding-mantle, made of fheet-iron or 

 copper J the frame of which may for ornament be cover- 

 ed with plates of brafa, and brafs may alfo cover as much 

 of the grooves as are in fight on each fide of the fire-place 

 in which the fliding-mantle moves. The arms a, ^, extend 

 TO fuch a length as to free the marble and let the cord 

 draw perpendicularly over the pullies /', b. The weights 

 to balance the fliding-mantle, and move freely behind 

 the pilafters or frame compofing the frontice piece of the 

 chimney. 



The grooves which receive the tongues of the fliding- 

 mantle, as well as the pullies, muft be fixed firmly in 

 the brick work, and fitted to fet clofe to the wall form- 

 ing the front of the chimney. — Thefe are covered by the 

 wood work and marble flabs, which may be ornamented 

 according to the prevailing fafhion. 



The dotted lines fhew the arms, lines, pullies and 

 weights in figure B, with the fliding-mantle drawn half 

 way down to the hearth. 



The frontice piece will be moll convenient if made in 

 two or more parts. That part extending above the pro- 

 jecting mantle-piece which is to cover the pullies and flid- 

 ing-mantle, needs only a fmall projedlion and may be 

 made of pannel v,'ork or an ornamental mirror. It 

 fhould be leparate from the other part of the breaft work, 

 in order to replace the cords when v.'orn out. 



Iron 



* Thefe improvements are fecured by a patent right to Charles and 

 Raphaelle Peale, after the communication of the defigns to the Philofo- 

 phical Society. 



