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Method and apparatus for spacing electrodes
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Electrode and method of producing the same
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Furnace construction
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Apparatus and process for treating materials such as metal powder
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Improvements in or relating to methods of and apparatus for treating sulphide ores
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Improvements in or relating to processes for eliminating chlorine from solutions containing zinc chloride and to improved solutions obtained thereby
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Process for producing metal powders
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Drying and roasting furnace
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Separating metals
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Ore cooling apparatus
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Elimination of chlorine from solutions
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Glass melting-preheater and mixer
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Furnace construction
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Improvements in or relating to multiple hearth roasting furnaces
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Roasting-furnace construction
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Method of producing metallic powders
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Roasting apparatus
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Furnace rabble arm
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Furnace rabble arm and tooth construction
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Roasting-furnace construction
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