Keywords: AluminumFromClay 001.jpg The final step in the production of alumina from clay in the pilot plant at the National Bureau of Standards is the conversion of hydrated aluminum chloride to alumina by calcination The aluminum chloride crystals are fed into the hopper at the top of the 20-foot Herreshoff furnace and are stirred constantly by rabble arms as they pass downward over the heated hearths National Institute of Standards and Technology 5/1/1947 National Institute of Standards and Technology PD-USGov-NIST The images in the Aluminum from Clay Photographic Collection are in the public domain and are not subject to copyright in the United States However please pay special attention to the individual works to make sure there are no copyright restrictions indicated Individual works may require securing other permissions from the original copyright holder Use of the images from NIST Digital Collections is not restricted but a statement of attribution is required Please use the following attribution statement National Institute of Standards and Technology Digital Collections Gaithersburg MD 20899 PD-USGov National Bureau of Standards National Institute of Standards and Technology |