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ron base is peroxidized in the hide by means of the chromic acid, which is itself reduced to the state of sesquioxide, and remains with the iron and a portion of the alumina base, firmly united with the tissue. Oscillating tan-vat. 3. The alum process consists in applying to the skins a saturated solution of alum and salt, followed by dressings of flour, yolk of eggs, oil, etc. See tawing. Plunging-vat. For tanning in vacuo, see patents: — No.Name.Date.No.Name.Date. 23,360.Fergusson.Mar. 29, 185960,524.Johnston.Dec. 18, 1866 29,656.AldrichAug 21, 186075,391DotyMar 10, 1868 48,361.Brewer et al.June 27, 186584,190.HosmerNov. 17, 1868 Rotary-movement tan-vat. Symonds' process for utilizing the useful matters which are not withdrawn from the bark by steeping, consists in burning the spent bark and conducting the products of combustion into a trough filled with water, where the solid and soluble portions are retained. Tan′ning-appa-ra′tus. A vat with devices<