Bulletin . rts at Aetna Mine, Napa County. The T of 1 pipe at retort dooris the inlet for air circulation. Water-wheel and fan are at right, just out of picture. The 10-inch pipe retorts arc usually 9 feet in lenoth, and the 12-inch,7 feet in length, the capacity thus varying from to cu. ft. Inthe usual practice the retort is not completely filled with ore, so that a That was in 1903. QUICKSILVER RESOURCES. 213 supply of free oxygen will be present to unitr with the sulphur drivenoff and prevent its reuniting with the vaporized mercury. In some instances an air circulation has been pro
Bulletin . rts at Aetna Mine, Napa County. The T of 1 pipe at retort dooris the inlet for air circulation. Water-wheel and fan are at right, just out of picture. The 10-inch pipe retorts arc usually 9 feet in lenoth, and the 12-inch,7 feet in length, the capacity thus varying from to cu. ft. Inthe usual practice the retort is not completely filled with ore, so that a That was in 1903. QUICKSILVER RESOURCES. 213 supply of free oxygen will be present to unitr with the sulphur drivenoff and prevent its reuniting with the vaporized mercury. In some instances an air circulation has been provided, particularlyin handling- concentrates. This was done with a water jet by R. at Oat Hill. Napa County, the arrangement being describedby the writer^^ in a recent report on the mines of that county (seePlate XXIV). Another arrangement for accompliishing the same pur-pose is that adopted with the D retorts at the .Etna Mine. NapaCounty. (See Photo No. 41.) A 1-inch iron pipe is fitted into the. Photo No. 42. Johnson-McKay retort, showing circulation system. door of the retort, and extends nearly to the back end of the exit pipe leads out from the side, just back of the door. In draw-ing off the burned ore and also while filling the retort with a freshcharge, the exit pipe is kept clear by inserting a plug in the fan in the condenser system, driven by a small water-wheel, main-tains the draft through the retort. Both ore and concentrates weretreated in these Aetna retorts. The Johnson-McKay pipe retorts have a special arrangement offlues (see Photo Xo. 42), by which the portions of the pipe near thefront and back ends receive the greater part of the heat. The following ^Bradley, Vi^. W., Mines and Mineral Res. of Colusa, et al. Counties; Cal. StateMin. Bur. cliapters of State Mineralogists Report, 1913-1914, p. 117, 1915; also InState Mineralogists Report XIV, p. 289, 1916. 214 CALIFORNIA STATE MIXING BUREAU. statement is furuislied by the ma
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