Patent For Wetherill Belt Magnetic Separator

III. A. Section of the Wetherill magnetic separator, Rowand type. B. Section of the Wetherlll magnetic separator. The type that has ... The patent for the thoria mantle was issued in 1886. Another experiment was made of treating the mantle made of thorium and cerium oxides with silico-zirconates of soda. See page 34 under Thoria.

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