An ancient wind-powered iron smelting technology in Sri Lanka (original) (raw)

Nature volume 379, pages 60–63 (1996) Cite this article

Abstract

BEFORE the development of the blast furnace, iron smelting was achieved by ore reduction at temperatures below the melting point of the metal, forming an agglomerated 'bloom' of low-carbon iron and slag. The forced-draught (bellows-operated) shaft furnace known from archaeological studies is usually regarded as the pinnacle of this early smelting technology1–3. Examples of natural-draught furnaces, in which gas buoyancy in a shaft of sufficient height induces a draught adequate to drive the smelting process4, are also known, but are generally regarded as disappointingly inefficient by comparison5. Here I report the discovery and excavation at Samanalawewa, Sri Lanka, of a previously unknown furnace type. The furnaces are all situated on the western margins of hills and ridges, where they are exposed to the strong monsoon winds. Field trials using replica furnaces confirm that this furnace type uses a wind-based air-supply principle that is distinct from either forced or natural draught, and show also that it is capable of producing high-carbon steel. This technology sustained a major industry in this area during the first millennium AD, and may have contributed to South Asia's early pre-eminence in steel production.

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References

  1. Tylecote, R. F. A Histoiy of Metallurgy 2nd edn (The Institute of Materials, London, 1992).
    Google Scholar
  2. Rostoker, W. & Bronson, B. Pre-industrial iron (Archeomaterials Monogr. 1, Philadelphia, 1990).
    Google Scholar
  3. Bamberger, M. in Furnaces and Smelting Technology in Antiquity (eds Craddock, P. T. & Hughes, M. J.) 151–158 (British Museum, London, 1985).
    Google Scholar
  4. Rehder, J. E. Archeomaterials 2, 47–58 (1987).
    Google Scholar
  5. Killick, D. in Recent Trends in Archaeometallurgical Research (ed. Glumac, P.) 47–54 (Science and Archaeology Vol. 8, Univ. Pennsylvania, Philadelphia, 1991).
    Google Scholar
  6. Hadfield, R. J. Iron Steel Inst. 85, 134–186 (1912).
    Google Scholar
  7. Schoff, W. H. J. Am. oriental Soc. 35, 224–239 (1915).
    Article Google Scholar
  8. Bronson, B. Archeomaterials 1, 13–51 (1986).
    CAS Google Scholar
  9. Chakrabarti, D. K. The Early Use of Iron in India (Oxford Univ. Press, Delhi 1992).
    Google Scholar
  10. Craddock, P. T. Early Metal Mining and Production (Edinburgh Univ. Press, 1995).
    Google Scholar
  11. Faraday, M. Q. J. Sci. Lit. Arts 7, 319–330 (1819).
    Google Scholar
  12. Zschokke, B. Rev. Métall. 21, 635–669 (1924).
    Article CAS Google Scholar
  13. Maryon, H. Stud. Conserv. 5, 25–37, 52–59 (1960).
    Google Scholar
  14. Allan, J. W. Persian Metal Technology 700–1300 AD (Ithaca, London, 1979).
    Google Scholar
  15. Wadsworth, J. & Sherby, O. D. Prog. Mater. Sci. 25, 35–68 (1980).
    Article CAS Google Scholar
  16. Domrös, M. The Agroclimate of Ceylon (Franz Steiner, Wiesbaden, 1974).
    Google Scholar
  17. Cooray, P. G. An Introduction to the Geology of Sri Lanka (National Museums of Sri Lanka, Colombo, 1984).
    Google Scholar
  18. Herath, J. W. Mineral Resources of Sri Lanka (Geological Survey Dept, Colombo, 1980).
    Google Scholar
  19. Juleff, G. Ancient Ceylon 9, 75–107 (1990).
    Google Scholar
  20. Malim, T. J. P., Juleff, G. & Shotliff, A. in South Asian Archaeology 1995 (edsAllchin, F.R. & B.), (Oxford & IBH, New Delhi, in the press).
  21. De Silva, K. M. A History of Sri Lanka (Hurst, California, 1981).
    Google Scholar
  22. Forenius, S. & Solangarachchi, R. in Further Studies in the Settlement Archaeology of the Sigirya-Dambulla Region (eds Bandaranayake, S. & Mogren, M.) 135–144 (Postgraduate Inst. Archaeology, Colombo, 1995).
    Google Scholar
  23. Percy, J. Metallurgy, Vol. 2, 271–273 (Murray, London, 1864).
    Google Scholar
  24. Rostoker, W., Bronson, B. & Dvorak, J. R. Archeomaterials 3, 11–25 (1989).
    CAS Google Scholar
  25. Avery, D. H., van der Merwe, N. J. & Saitowitz, S. in The Beginnings of the Use of Metals and Alloys (ed. Maddin, R.) 261–282 (MIT Press, Cambridge, MA, 1988).
    Google Scholar
  26. von Hammer Purgstall, J. J. Asiatique 5, 66–80 (1854).
    Google Scholar
  27. Cresswell, R. G. J. hist. Metall. Soc. 25, 76–85 (1991).
    Google Scholar
  28. Kusimba, C. M., Killick, D. & Cresswell, R. G. in Society, Culture and Technology in Africa (ed. Childs, S. T.) (Science and Archaeology Vol. 11, Univ. Pennsylvania, Philadelphia, in the press).
  29. Somasekaram, T. (ed.) National Atlas for Sri Lanka (Survey Dept, Colombo, 1988).

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Authors and Affiliations

  1. Samanalawewa Archaeological Project, Archaeological Department of Sri Lanka, Sir Marcus Fernando Mawatha, Colombo, 7, Sri Lanka
    Gill Juleff
  2. University College London, Institute of Archaeology, 31–34 Gordon Square, London, WC1H 0PY, UK
    Gill Juleff

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Juleff, G. An ancient wind-powered iron smelting technology in Sri Lanka.Nature 379, 60–63 (1996). https://doi.org/10.1038/379060a0

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