MantifaSlure of Gilt Butto?is. 19 



poor fwcep who has afcendcd the chimneys has been fallvatj^dj 

 tind the niantifkclurer has faliaincd coniiderable lofs. ' ' ^' 



To preferve ji prinrfpal part of the mercitrv' thus diffipat'c^uj 

 and to prci'Crtt/in a great meafiire, the terrible effeAs of it 

 on the conftitution of the operator, is the objet^\ of thefe re- 

 inarks, as far as it regards mnn'afaiturers. 



By means of an apparatus limilar to the plan delineated in 

 Plate I. fig. 3. which has been partially and fuccefsfully 

 adopted by Mr. Mark Sanders, an eminent button-maker of 

 Birmingham, the principal part of the mercury may he re- 

 covered, and the health of the operator greatly preferved. '■ 



A hearth of the ufual height is to be ereft^d, in ube 

 middle of which a capacity for the fire is to be made; but 

 in(!ead of permitting the fnioke toafcend into the top i\, made 

 of fheet or cafl iron, through which the mercury is vol'atilifed; 

 a flue for that purpofe fliould be conduced backwards to the 

 chimney B. An iron plate, thick enough to contain heat 

 fufficicnt to volatilife the mercury, is to cover the fire-piace at 

 the top of the hearth C. There muft be an afli-h6le,'D, 

 under the fire-place. The fquare fpace E, feen in the fire- 

 place, is the flue, which fervcs to carry the fmokc backunder 

 the hearth into the chimney B. The door of the fire-place 

 and afh-pit may either be in front, as reprefented in the plate, 

 or at the end of the hearth at F, which will p^rh^pi^ I'efs in- 

 commode the worlc-people. It would be of crreit advantage 

 if the fpace between A and the iron plate C was covered up 

 with a glafs window coming down fo low as only to leave 

 fnfiicient room for moving- the pan backwards and forwards 

 with facility. If the fides were alfo glafs inftead of brick- 

 work it w^ould be Uill better, as the work-people would be 

 able to have a full view of their work without being expofed 

 to the fumes of the n;iercury, which, when volatilifed by heat 

 communicated to the pan by the heated iroii plate over the 

 lire-place, would afcend into the top A, appropriated for its 

 reception, and defcend into the tub G, covered at top and 

 filled pretty high with water. By this means the hearth 

 would, in faft, become a diitilling apparatus for condenfing 

 and recovering the volatilifed, mercury. In the tub G the 

 principal part would be recovered ; for, of what may.Itill pafs 



C 2, 0\\y 



