De/criplion of a Three-bhift Fujlug Furjiace* 7'^ 



oF copper, two inches in diameter, bent at right angles 

 about 45 inches beloxv it, to bring them into a liorizontal 

 pofition, and to convey the wind to the furnace, which is 

 about fix iect diltant. Theextreraiiies of thefe pipes are 

 illtcd into three tuveres of forged iron, fixed at ecjual diftances 

 around the circumference of the furnace : thele three pipes 

 are niore or Icfs curved or bent, to convey the wind into the 

 furnice bv the three apertures r>iadc for that purpofe. 



About fix inches below the box is adjulted, on each of the 

 three tubes, which dclcend in a vertical direction, a brais 

 cock about three iiiches of interior diameter : thefe cocks 

 ierve to intercept entirely the communication Ijetween the 

 bellows and the fur«ace ; and by opening them all more or 

 lefs, or eych of them feparately, any required qflantity ot 

 wind may be obtained *. 



Thefe cocks ar« well fixed to the tubes, and kept in their 

 place by two clips of iron fuited to the diamlntrrs of the 

 tubes, and forming a kind of three collars, which by mean:? 

 of four fcrews embrace and confine thern : thefe pie cs ot 

 iron arc themfclves made faft to two crutches of iron, wliiJ^ 

 /upport the box and are fixed to it by fcrews. The box is 

 kept on the crutches by two (haps, which embrace it at each 

 extremity, and are fixed by female fcrews, which are fitted to 

 fcrews on the ends of thefe ftraps after they have paii'cd 

 through the horizontal part of the two crutches. 



To give the proper Itrcngth to this furnace, a folid fquare 

 was conftrucfed of malnn-w">rk, about a foot larger on each 

 ■fide than the exterior diatiieter of the fides of the furnace, 

 which were from 2i to 22 inches from oulfide to outfide. 

 Bricks were placed on the ground in the middle of this erec- 

 tion for the extent of i8 inches, in order to form a bottom, 

 and on this bafe were placed the fides of the furnace con- 

 ilrufted in the manner about to be defcrihed. 



I caufed to be forged two iron hoop? fix lines in tbickncfs, 

 from 2 to 2' inches in breadth, and about 22 inches ot ex- 

 terior diameter : thefe two circles were faftened together by 

 three bars ui' inw), the difiance of their exterior edge being 



*Circ miift i)c ('.ktii, when the i.i'iion of tlu IxHows cc.ifcs.to Ihut tixe 

 f'icks, cCpctially v^lun c(»ils arc- ylod li) the furnace; for tlit hvlrogcn dif- 

 engaged from that mineral ftibftatice afrtiids inrn the box and when the 

 Lcliou 6 are agi'm made to a£k, iHav infl.ime, and cauCc a violtnt cxplolioi), 

 pr cvco byrH ibj;, l^cUows. Tll"i» apqidcnt oncf. took jilace in tin: fornatc 

 here dcfcribKd : the \w\ butft wiih a loud noiCc im tlic In ft ftrokc o; cUp 

 fellows, Uid pv ^yl^ich filltd ^(itiji having fud >iily infl.Hincd ; but by 

 'good fortune nv perfiiii ua; hurt.' The Ihiik :hlii;; h.ipptnc! at thi lioiil,e 

 <!»■ C CJorhtr, I.Hkrmith. of Puris : one of liis bcilows hnrft: with' 3 liorriU 

 irxplofjun at tku: niwiiMit \vjacxi ihtfy.u'crc put in nv<tj<ja, 



K 4 I<i"pt 



