| 11. | Two small reverberatory furnaces were installed at the smelter.
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| 12. | The first mine established during this period was at reverberatory furnaces were operating by 1872.
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| 13. | In July, the first reverberatory furnace went into service the foundation of metallurgical manufacturing.
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| 14. | A new reverberatory furnace was built and a water pipeline laid to the Severn River.
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| 15. | Puddling was done in a reverberatory furnace, allowing coal or coke to be used as fuel.
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| 16. | In the following decades, reverberatory furnaces were widely adopted for smelting these metals and also tin.
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| 17. | This was probably a reverberatory furnace and the first known use of such for this purpose.
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| 18. | This improved operating conditions within the reverberatory furnace.
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| 19. | By 2002, 20 of the 30 reverberatory furnaces still operating in 1994 had been shut down.
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| 20. | Smelting was initially undertaken using sinter plants and blast furnaces, or with roasters and reverberatory furnaces.
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