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A supposed crystal lens from Kuyunjik (Iraq)

A supposed crystal lens from Kuyunjik (Iraq)

In 1853, Sir David Brewster (1781-1868) presented a lens to the British Association for the Advancement of Science that had been found in excavations by Austen Henry Layard (1817-1894) at Nineveh (Kuyunjik, Iraq). It had been found in deposits dated around 600 BCE and although its provenance was not in question, doubts were raised about its function. Whilst it clearly works as a lens, it was thought to have been used as a decoration in a piece of jewellery, although Brewster himself believed it to have been a true optical lens.

With this object, we can see how contemporary perceptions of form and function may not always be correct. The ‘obvious’ interpretation of a ground oval crystal with a biconvex cross-section as an optical lens is not a guide to its original function. What would be the context for such a piece in the ancient Near East? Had it been part of a piece of optical equipment, there ought to be other evidence for such equipment. If, say, it were part of an astronomical telescope, then elements of the telescopes and their mountings ought to be found. If part of a pair of spectacles, then some sort of frame should be found from time to time. The absence of this type of material makes the lens explanation rely on special pleading and the use of irrelevant evidence (such as the ability of pre-Columbian Americans to make tiny gold beads, as quoted by Berlitz). As part of an item of jewellery, its accidental magnifying properties could have made it more curious and valuable.

3 Responses to A ‘crystal lens’ from Nineveh

  • I suppose it could have been used as a jewelers lens, or it could have been a toy. We simply don’t know.

  • Greg Ewing says:

    if it was a simple optical lens, then it could easily have originally been in a frame that did not survive. We cannot know precisely what it was intended for without further evidence. While the likelihood that it was part of a telescope is extremely, almost vanishingly low, it might be reasonable to not dismiss out of hand the simpler possibilities. A portion of an item of jewelry is reasonable. A simple lens probably is. In this particular case, the old fallback of “ceremonial purposes” might actually be reasonable. I don’t know much about the culture of Nineveh, but might they have had reason to use it as a lens to start a ceremonial flame? It is always fun to speculate.

  • gary says:

    how about fire starting, lens as such could be used for that.

Agree or disagree? Please comment!