Chemistry engraving – obtain hydrogen by dissociating water

A device to obtain hydrogen by dissociating water over glowing iron: the hot iron used the water oxygen to form an iron oxyde thus leaving the hydrogen free.-An iron pipe filled with iron shavings was heated up in a furnace; as the temperature was high enough water vapour was pumper through the pipe; the oxygen remained in the pipe as iron oxide and the free hydrogen was collected in a water-filled cylinder closed at the upper end and immersed in water.

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