| 21. | In 1825 Michael Faraday discovered that sulfuric acid could absorb large volumes of coal gas.
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| 22. | It used coal gas ignited by an electric spark.
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| 23. | The balloon was enlarged and tried again with coal gas, as in his previous attempt.
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| 24. | He then adapted the gazom�tre for coal gas storage.
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| 25. | Its main use was for lighting purposes especially in places where coal gas was not available.
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| 26. | It's explained in the article on coal gas.
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| 27. | Coal gas-lit lampposts providing lighting along the bridge.
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| 28. | A later version was propelled by coal gas.
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| 29. | Coal gas street lighting was introduced in 1838.
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| 30. | Coal gas is captured during the coking process, with individual chemicals subsequently separated from the gas.
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