On the Fahrtcathn of Charcoal in the Forejl de Benon. 245 



n&fraftorv glafs, which are not to be melted while undergoing 

 Oiis rotatory motion, may be readily ful'ed in any fpot con- 

 ftantlv expoCed to the action of the fiaine. 



In order to produce a flame which (hould be free from the 

 inconveniences juft defcribed, I procured the oblont; lamp 

 with two wicks W, X, Fig. 1. It may be obferved, that 

 thefc wicks are fixed on two plates, which Aide in a groove, 

 in the dire<:-lion of the length of the lamp. They '^-^Y there- 

 fore be made to approaLii to, or recede from each other. 

 This lamp being as reprefenled in the engraving placed on 

 the little Itand T V, fo as that one of the^wicks was before 

 tile ori lice of the ftraicrht mouth- piece, above a; the bent 

 blow-pipe at W was fo adjulied lo the other wick, that wheii 

 they were both lighted, and a blalt palfed over them, their 

 flames met each other as reprefented in the plate. The re- 

 fult of this was, that a much larger tube could be fufed by 

 tiie united action of two ilames, than could be melted with 

 one of them ; and the pans being more erjnally heated, a 

 bend coul.J be made more regularly, and with lefs danger of 

 collapfing. 



It may be proper to •obferve that the machine reprefented 

 in the plate is much niore complex and expenfive, than is 

 requifite for the purpofes of the mouth blow-pipe, or ena- 

 inellers' lamp, (imply. But it is expected that artifts, avail- 

 ing themfelv'es of the principles of the machine, will reje^a 

 ihofe appurtenances which are unnecellary to their peculiar 

 purpolcs '•. 



£To .he continued. ] 



XXXVII. Memoir on the Fahication of Charcoal in the 

 Forc/i de Benon, near Rochelle. Addrclfcd to the French 

 Council of Mines, Nivc/'e 30, Year 10. Bj C. Fi EU Ul A u- 

 Bkllevuh f. 



Jr UE.L of everv kind is fo fcarce in the neighbourhood 

 of Rochelle, that ttiere are few manutaClories u\ that quar- 

 ter, and none of thofe which confuine a large quantity of 

 that article can be eftablidied. Wood is fold exceedingly 

 dear, and there is Icarcely a quantity fufticieut for diftilling 

 the wines of the country. 



'" The (oft of the machine rcprcrented in thp j>lafe w:is a' out twenty 

 foliar*; l)ut a machine fully equal to the pvui'iiles o( the mouth blow- 

 |>ipc, or enHiiiellcii' lamj', niiiy he made for one liftli of that lum. 



t From the Journut Jes Minei, No. 65. 



Q3 I» 



