Total
peters. The Pncticc of Copper Smelting, 1011.
If nluminn is tnkcn ns n bnso tho oxygcn rntio will bo 26-21 : 15*00=1.fil. If wo lcnvc it out of tlie cnlciilotion, tho rc.~nlt is 25.21 : 11*86=2*12. I fccl inclinyd to ndopt this lnttcr fi wrc, nccording t o which tlic slng is evcn moro ncid tiinn tknt prodirccci nt &nilwood ( ~o .
3).
tho rntio of which is 1.9 nnd which is nn unusunl one in coppcrsmclting. T c t thcslng, which rcquircs n high forinntion nnd flowing tcmpcrnture, gnvo no traublo nrid tilo furnncc workcclsnioothly without nny occnsionnl correction in thocomposition of thcchnrgc. Thus Isnw onccnn~i~nipn l n ~t i n g 63 dnys which onlycnnic to nn end through n brcnkdown of thc blowing cagitie.
Tho bnrium in thc slug is pyscnt ns silicntc ShOWillg thnt nndcr tho conditions prcvniling in tlw furnncc bnrium sulphntc is broken up. Tho nniount of copjrr last in thc sing (0.1 to 0.2 pcr cent.) vnriccl with tho grnde of iiiutte produccd ; qolcl nntl silver wcrc sntisfi~ctorily rccovcrccl.
Jfotte. Tho nnnlysis reproducccl lierc is thnt of n low gri1dC miittc protlucctl while the furnncc rnn slnggishly; wliich enused bad Pepnmtion. Thc dcficiciicy of 28 In-r ccnt.. is clnc chicfly to oxitlcs prcscnt in the slng wliich wcrc not cstimntccl. The following is n pnrtiiil nnnlpis of nn nrcrnqo suiiiplo from 50 consccutivc tnppings : Cll