In 1900, Greek divers rifling through an ancient shipwreck recovered dozens of bronze fragments that turned out to be parts of a 2,000-year-old mechanical calendar. Now, more than a century after that discovery, scientists who studied these pieces are hailing the device as remarkably advanced for its time.
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Using computer imaging techniques previously unavailable to researchers, a team led by mathematician Tony Freeth of the University of Cardiff reconstructed the Greek instrument, known as the Antikythera Mechanism, from the 82 recovered fragments. The original mechanism involved 37 gear-wheels held together by a complex pin-and-slot system, the researchers report in the Nov. 30 Nature.
One section of the instrument's gear systems predicted lunar and solar eclipses, another synchronized lunar months and solar years. A large gear in the middle indicated the position of the moon.
"The Antikythera Mechanism is the most sophisticated such object yet found from the ancient and medieval periods," writes François Charette of Ludwig-Maximilians University in Germany in a commentary accompanying the paper.
Freeth's team deciphered previously illegible inscriptions on the wooden walls that housed the mechanism. Based on these markings, the calendar likely dates to about 150 B.C., the researchers report.
Physical evidence of an ancient technology is rare, says professor of Greek and Roman studies John Humphrey of the University of Calgary, who recently published a book on the subject. Most early devices are known from writings describing the machines, which may or may not have been built.
"That's what makes the Antikythera Mechanism different," he says.
Humphrey, who was not part of the new research study, highlights some other intriguing early technologies:
The Bottomless Wine Glass
Inventor: Hero of Alexandria
Date: Around 65 A.D.
How it works: The goblet is connected to a reservoir by a tube. As a person drinks wine, the liquid level in the reservoir falls, releasing a plug coming from a hidden reservoir. As the liquid levels replenish—perhaps between gulps—the plug once again stops the hidden reservoir.
Proof of complexity: Several of Humphrey's engineering students have been unable to replicate the device's complex plug.
Quirk: "The trouble is, you have to drink the wine through a straw," Humphrey says.