. A Reference handbook of the medical sciences : embracing the entire range of scientific and practical medicine and allied science. rly diluted hydro-chloric or sulphuric acid. The metal is then dipped introughs containing the spelter, melted zinc, and fromtime to time sal ammoniac is sprinkled on the surface ofthe bath for the purpose of cleaning the melted spelter byabsorption of the oxide. This viscous and inactive oxi-chloride of zinc is skimmed off. The galvanizers scum issubsequently treated for the recovery of the sal ammoniacand spelter. Galvanizing works are a source of nui-sance on
. A Reference handbook of the medical sciences : embracing the entire range of scientific and practical medicine and allied science. rly diluted hydro-chloric or sulphuric acid. The metal is then dipped introughs containing the spelter, melted zinc, and fromtime to time sal ammoniac is sprinkled on the surface ofthe bath for the purpose of cleaning the melted spelter byabsorption of the oxide. This viscous and inactive oxi-chloride of zinc is skimmed off. The galvanizers scum issubsequently treated for the recovery of the sal ammoniacand spelter. Galvanizing works are a source of nui-sance on account of the production of a mixed odor,partly alliaceous from the arsenic in the zinc, partly acid,if the baths are heated, together with a peculiarly offen-sive one from the hydrogen which is always produced bythe action of acid on iron. People complain of theseodors as suffocating and producing headache and a feel-ing as if they were blown up (Ballard). It is almost impossible to control the odors. Hoodscannot well be placed so as not to interfere with the iu- 208 REFERENCE HANDBOOK OF THE MEDICAL SCIENCES. -**<—* Fig. 3999.—Hypothetical Section of Gas Works. Vol. VII.—14. troduction of the large sheets of metal, which are to begalvanized, into the bath. About the best that can bedone is to hang an iron hood from the roof of the work-shop and carry off the fumes at as high a level as possible,and to keep galvanizing works as far away from inhal itedneighborhoods as possible. In the tinning of ikon and tempering of tools, thepeculiar acid odor of hydrogen, already spoken of, min-gled with the acrolein from the palm or other oils in the grease pans in which the metals are dipped prior toannealing and tempering, will travel about 300yards from the works. The fumes should be drawn offby a fan and condensed by a scrubber. In both galva-nizing and tinning works the spent pickle is evapor-ated and the sulphate of iron is recovered. The vesselsin which thi
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Keywords: ., bookcentury1800, bookdecade1880, booksubjectmedicine, bookyear188
