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+"Baltimore Maryland USA" +1927 stock footage and images
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Process by which pure copper obtained from smelted copper in a Baltimore refinery.
Copper impurities remained after smelting removed by melting and electrolysis. Tank room of electrolytic refinery plant at Baltimore. The anodes placed in empty tank. Thin sheets of pure copper, serving as cathodes inserted between the anodes. The tank then filled with a dilute solution of copper sulphate. An electric current flows from the anode, through the solution, to the cathode on which pure copper is deposited. After removing the cathodes from remnants of anodes a sludge, into which the gold, silver and platinum has fallen, flushed out of the tank. Sludge melted by a worker into a bullion bar. The copper cathodes melted.
Pure copper caste in various commercial shapes.
Pure copper caste in commercial shapes. Copper bars dumped from mold into cooling tank. Workers inspect the wire-bars. Various commercial shapes caste to meet particular requirements of copper fabrication.
Dead rodents lying on a ship after it is fumigated at Baltimore Harbor in Baltimore, Maryland.
Ships are fumigated at Baltimore Harbor in Baltimore, Maryland. Men at the harbor put a poisonous powder in a ship. A man puts the poisonous powder in a bucket, lifts it up and sprays it on the ship. The man covers the portion of a ship where the powder is sprayed. Another man with a cigarette in his mouth closes a door of the ship. Men at the harbor cover the ship. Dead rodents lying on the ship after the spray of the poisonous powder