Chemical engineering . n ofthe openings fromthe hood to the stack e(|uals that of the free space in the stack. The hood is the wall of the building, and parallel to this wall is asecond one. leaving a free space of 4 inches between them,which communicates with the hood by a number of 2 x 4-inchholes along the flour, and with the stack by a larger openingat the highest priint of the hood. This construction gives agood draught along the floor, as well as at the apex of the -TIIK Iolll KM AN IN ROT.\TINX M.\CHINE. .v?-^ ELKCTROCHKMICAI. ANP IXDLSTRV. |Vo, 1
Chemical engineering . n ofthe openings fromthe hood to the stack e(|uals that of the free space in the stack. The hood is the wall of the building, and parallel to this wall is asecond one. leaving a free space of 4 inches between them,which communicates with the hood by a number of 2 x 4-inchholes along the flour, and with the stack by a larger openingat the highest priint of the hood. This construction gives agood draught along the floor, as well as at the apex of the -TIIK Iolll KM AN IN ROT.\TINX M.\CHINE. .v?-^ ELKCTROCHKMICAI. ANP IXDLSTRV. |Vo, 111. Xo. <). hood, and, regardless of the amount of copper that Is with nitric acid, there is never any odor ofred fumes in the work room of our regard to cleanliness of work in the laboratorv. quotes his first teacher in practical chemistry. Heniiann\on Fchling. who used to tell his students that Dcr CUcmikcrmuss im Frack-An:uR arheilcn kociiiicn. This remark a lasting impression upon me, and ] have always disliked thesight of black or yellow hands, or of work-clothes havingmany spots and holes. It is not given to everyone, how-ever, to be as tidy as Fehling was, but it is possible to aidnatural defects by artificial means. FOR HANDLING BeAKERS AND AciDS. .^ssaying forms the bulk of the work at the Baltimorelaboratory. Scores of silver-determinations and hundreds of scorifications and cupellations for gold arc often made. Silver,and sometimes gold, is determined in the metallic copper ma-terial by what is commonly known as the combination method,which consists in dissolving both copper and the containedsilver in nitric acid, leaving the gold as a metallic silver is reprecipitatcd in the form of chloride and, withtlio sold, is separated from the copper solution by of the filter, scorificalion withmetallic lead, and cupellation with a subsei|ucntparting of the two p
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Keywords: ., bookcentury1900, bookdecade1900, booksubjectmetallu, bookyear1902
