;»f^ jy^fcripiion of a "three-hlajl Fujlng Furnace. 



be introduced^ fo as to defcend to this grate. There win'Re 

 two (f thenij on^ vvithiii the othfer, and both within the 

 body of ttie funwicfe. At the lower part thefe muffs will be 

 furnithed with a rim, projecting outward fo as to leave be- 

 tween the bodv oF the {urnace and the mufls a vacuity, which 

 will be luted at the bottom with clay, and whieh wiH be 

 ♦iUtfd Avith pounded glafs. or any other fubitaiice a bad Cbn* 

 duaorofheat.-''i;'' '• ■• ■-■-', '^ •■ ■" '''^" •^'■'^ 



The interior mu^, or both of thfem, mnybe renvVved a.t 

 ^Icafurc to obtain a fumriife'<>f irreateror lefscapayitf accord-^ 

 ing to the operations to be perforni^ed. It is proppfed to make 

 the raufi's wider at the top than at the bottorhk ' •': 



Explarmtion of tl^& ^Figures (Plate L). 



Fio-. I. Plan of the bellows and of the furnace. A B, the 

 bello\Vs made of wood, the folds of which are atfo of wood 

 covered with leather on the joints. CD, the handle which 

 (erves for moving the bellows. E, a copper lube which con- 

 veys the wind of'the bellows into the box FG, in which it is 

 condenfed. FG, a box of wood ferving as a refervoir for the 

 wind condenfed by the bellows. HI, KL, MN, three pipes 

 adapted to the box FG, and which convey the wind into the 

 infide of the furnace by three tuyeres, I, L, N. O F, mafon- 

 work to fupport the horizontal pipes. Q, the furnace pro- 

 perly fo called, the form of which is circular, and which is 

 placed on the fquare mafon-work R, S, T, U. 



Fiff. 2. Elevation of the furnace, the pipes which convey 

 the blaft, the cock«, the condenling box, and the bellows. 

 AB, the bellows mounted in their ])lace, and fupportcd by 

 the iron-work neceHary for fecuring it, which is fixed in the 

 wall and to the floor. CD, the handle which ferves for 

 novinff ih^ellows. E, the copper pi])e which conveys the 

 blatt of the bellows to the box FG in which it is condenfed. 

 At G is a hole Ihut by a lai-ge cork ftopper, which can be 

 opened at pleafure. This box is fupporied by two crutches 

 of iron J,g, and h, i, built into the wall, and on which it i& 

 fixed by two iron tlirrups /, w. 



Fig. '3. One of the crutches and its ftirrup are feen reprc- 

 fented fidewife at f, g, I; the extremities, w, 0, are built into 

 the wall, and the two ends, p, q, of the iron piece which 

 keeps the box on the horizontal traverfe of the crutch, are 

 tapped, and receive fcrews which make them iaft to the 

 crutch/,^. HI, KL, MN, are three pipes which con- 

 vey the wmd into the interior of the furnace. Q, R,S,T,U, 

 ina4bni-'wo]4t- on which is placed the furnace Q, and which 



iervea 



