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Database: The Solar Cannon of the Palais-Royal

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Designed in 1786 by watchmaker and inventor Robert Rousseau, the solar cannon allowed strollers at the Palais-Royal to adjust their timepieces: when the sun reached the meridian, a magnifying glass was arranged so that the sun’s rays were directed to the touch hole of a small cannon. At noon precisely, it went off with a bang! A restored cannon works to this day.

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