Transactions . /^in. ( cm.) thick and are strengthened outside by concrete bottom is of 3 by 8-in. ( by cm.) Oregon pine laid edgewise,and is supported by concrete foundations. The sides and launders ofthe tanks are lined with 8-lb. ( kg.) lead and the bottom with 6-lb. 4-per cent, antimonial lead. The filter bottom is laid over the lead bottomand consists of 5 by 12-in. ( by cm.) joists on edge laid on Fig. 1.—Leaching tanks and excavator, New Cornelia Copper Co. ( cm.) centers, covered with 2-in. ship-lap planks that are boredwith %-in. (
Transactions . /^in. ( cm.) thick and are strengthened outside by concrete bottom is of 3 by 8-in. ( by cm.) Oregon pine laid edgewise,and is supported by concrete foundations. The sides and launders ofthe tanks are lined with 8-lb. ( kg.) lead and the bottom with 6-lb. 4-per cent, antimonial lead. The filter bottom is laid over the lead bottomand consists of 5 by 12-in. ( by cm.) joists on edge laid on Fig. 1.—Leaching tanks and excavator, New Cornelia Copper Co. ( cm.) centers, covered with 2-in. ship-lap planks that are boredwith %-in. ( mm.) holes on 2-in. ( mm.) centers countersunkfrom below. Under the center of the filter bottom, and at right anglesto the wooden floor joists, there is a distributing launder 5 ft. ( m.)wide by 2 ft. 9 in. ( m.) deep, set in the floor through which thesolution enters and from which it is distributed under the filter lead lining on the sides of the tanks is protected from abrasion bya covering of 2-in. planks held in place by 6 by 8-in. ( by cm.)vertical posts clamped at the bottom and top. At the top and sides ofeach leaching tank are two overflow launders extending the length of the HENRY A. TOBELMANN AND JAMES A. POTTER 29 tank, one end being connected with the suction of a circulating charging is done by means of a machine especially designed for thisplant and known as the spreader bridge; it con
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Keywords: ., bo, bookcentury1800, bookdecade1870, booksubjectmineralindustries
