Chemical engineering . o the precipitatingtank, filled with particles of aluminium and steel in such a waythat the solution can freely circulate therethrough. .Air andsteam are then introduced at the bottom of the tank, andpassed through the solution, whereby the copper is precipitatedand settles on the bottom of the tank. Lead Containers for order to increase the capability of ordinary commerciallead to withstand the corrosive eflfect of acids, H. E. Miller(786,581, April 4) proposes the following treatment: The leadis oxidized, preferably to the form of litharge, until about 95per c
Chemical engineering . o the precipitatingtank, filled with particles of aluminium and steel in such a waythat the solution can freely circulate therethrough. .Air andsteam are then introduced at the bottom of the tank, andpassed through the solution, whereby the copper is precipitatedand settles on the bottom of the tank. Lead Containers for order to increase the capability of ordinary commerciallead to withstand the corrosive eflfect of acids, H. E. Miller(786,581, April 4) proposes the following treatment: The leadis oxidized, preferably to the form of litharge, until about 95per cent are oxidized. The oxide and residuni are then sepa-rated and the litharge is reconverted into metallic lead,which will be found to have acquired a capability of resistingthe corrosion of acid equal to that of the most satisfactoryspecimens, regardless of its natural source or previous processof manufacture, so that the metal resulting from this processis of uniform and high excellence in the desired kk;. 3.—leaching tank. BOOK REVIEWS. contempt. It is regarded by many in somewhat the samelight as an index—very useful, but requiring only a loworder of ability to turn out. This way of looking at the subjectis altogether wrong, for the making of a good index requiresno small ability, and the skillful handling of scissors and pastedeserve high praise. Electric Furnaces and Their Industrial .Applications is abook of the scissors and paste variety, but we regret that theauthor has failed altogether to produce a work, althoughthere cannot be the least doubt that a book covering thesubject would be very welcome. Although Mr. Wright hasapparently made a most exhaustive catalogue of the tech-nical and patent literature of his subject and has included inhis book a large number of furnaces chiefly distinguished bytheir ingcinons information is so inaccurateand the carelessness of his descriptions so marked throughoutthat it seems diffic
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Keywords: ., bookcentury1900, bookdecade1900, booksubjectmetallu, bookyear1902
