Nimrud lens
The lens on display in the British Museum
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| Material | Rock crystal |
|---|---|
| Size | Diameter: 38 mm (1.5 in) Thickness: 23 mm (0.9 in) |
| Created | 750–710 BC |
| Period/culture | Neo-Assyrian |
| Discovered | 1850 Assyrian palace of Nimrud |
| Discovered by | Austen Henry Layard |
| Place | North West Palace, Room AB |
| Present location | British Museum, London |
| Identification | 90959 |
The Nimrud lens, also called Layard lens, is a 3000-year-old piece of rock crystal, which was unearthed in 1850 by Austen Henry Layard at the Assyrian palace of Nimrud, in modern-day Iraq. It may have been used as a magnifying glass, or as a burning-glass to start fires by concentrating sunlight, or it may have been a piece of decorative inlay.
The lens is slightly oval, and was roughly ground, perhaps on a lapidary wheel. It has a focal point about 11 centimetres (4.5 in) from the flat side, and a focal length of about 12 cm. This would make it equivalent to a 3× magnifying glass. The surface of the lens has twelve cavities that were opened during grinding, which would have contained naphtha or some other fluid trapped in the raw crystal. The lens is said to be able to focus sunlight although the focus is far from perfect. Because the lens is made from natural rock crystal the material of the lens has not deteriorated significantly over time.
The Nimrud lens is on display in the British Museum.
The function of the lens is not clear, with some authors suggesting that it was used as an optical lens and others suggesting a decorative function.
Assyrian craftsmen made intricate engravings, and could have used a magnifying lens in their work. The discoverer of the lens noted that he had found very small inscriptions on Assyrian artefacts which he suspected had been achieved with the aid of a lens.
Italian scientist Giovanni Pettinato of the University of Rome has proposed that the lens was used by the ancient Assyrians as part of a telescope, and that this explains their knowledge of astronomy (see Babylonian astronomy). Experts on Assyrian archaeology are unconvinced, doubting that the optical quality of the lens is sufficient to be of much use. The ancient Assyrians saw the planet Saturn as a god surrounded by a ring of serpents, which Pettinato suggests was their interpretation of Saturn's rings as seen through a telescope. Other experts say that serpents occur frequently in Assyrian mythology, and note that there is no mention of a telescope in any of the many surviving Assyrian astronomical writings.
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