A supplement to Ures Dictionary of Arts, Manufactures, and Mines, : containing a clear exposition of their principles and practice. . slight hissing sound, andin an incipient pasty condition. Insuccessive quantities the charge isthen drawn through a hole in thebed of the furnace into the wrinkleor arch beneath, whence it is re-moved to cisterns, in which it islixiviated with water, and the tungs-tate of soda is drawn off in solu-tion. The residuary mass left inthe cisterns,—the whole of the solu-ble matter having been washed out,—is removed to the burning-housefloors, and is there dressed over
A supplement to Ures Dictionary of Arts, Manufactures, and Mines, : containing a clear exposition of their principles and practice. . slight hissing sound, andin an incipient pasty condition. Insuccessive quantities the charge isthen drawn through a hole in thebed of the furnace into the wrinkleor arch beneath, whence it is re-moved to cisterns, in which it islixiviated with water, and the tungs-tate of soda is drawn off in solu-tion. The residuary mass left inthe cisterns,—the whole of the solu-ble matter having been washed out,—is removed to the burning-housefloors, and is there dressed overagain in the usual manner, the finalproduct of the operations being verynearly pure black oxide of tin. The liquid obtained is either evaporated sufficiently forcrystallization when set aside to cool, or is at once dried down to powder. The crystals oftungstate of soda thus obtained are colorless, translucent, of a beautiful pearly lustre, havingthe form of rhombic prisms or of four-sided laminae. The composition of the crystallizedand of the anhydrous tungstate of soda is as follows:— Anhydrous. Crystalline. 20-63 18-44. Soda - . -Tungstic acidWater - 79-37•00 70-9210-64 100-00 100-00 It has been proposed to use this substance as a mordant for dying purposes, as a sourceof supply of metallic tungsten for the manufacture of alloys, for the manufacture of thetungstates of lime, barytes, and of lead to be used as pigments; and still more recently ithas been found to be valuable, and preferable to any other substance, for rendering frabricsnot inflammable, so as to prevent the terrible accidents constantly occurring from the burn-ing of ladies dresses. For this purpose a patent has lately been obtained by Messrs. Vers-mann and Oppenheim. For the manufacture of metallic alloys a patent has been obtained by Mr. R. Oxland,as a communication from Messrs. Jacob and Koeller. Steel of very superior quality, man-ufactured under this patent, is now coming extensively into use in Ge
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Keywords: ., bookcentury1800, bookdecade1860, bookpublishernewyo, bookyear1864
