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Sulfur Dioxide: Sulphur Burnt in Air or Oxygen (Thorpe, 1913)
Sulphur dioxide by the oldest route: sulphur burnt in air or oxygen. It catches fire at about 250-260° and gives a volume of sulphur dioxide equal to the oxygen it uses.
The gas is heavy and is collected by downward displacement, like carbon dioxide; over mercury if it must be free of air. It is poisonous: 1 part in 2500 of air makes breathing hard and hurts the eyes.
Source: T. E. Thorpe, Dictionary of Applied Chemistry vol. V (1913), p. 302. Picture: the book's text.
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