Sundial Alarm Clock Goes off with a Bang

sundial

This unusual clock is a solar cannon. It's a sundial that fires a tiny cannon when the heat of sunlight, concentrated wih a lens, detonates gunpowder. In a 1903 treatise on solar energy, Charles Henry Pope wrote:

In the issue of the American of December 30, 1882, an account is given of the "solar cannon of the Palais Royal in Paris, France, which is fired by the heat of the sun at noon, concentrated by means of burning glass, falling on the powder priming of the cannon."

Link -via Pocket Pistols, Historic Firearms, & Curiosities | Photo: Little Gun


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The only problem is most mass-produced sundials aren't designed for any particular latitude. The numbers on the dial wouldn't match, but I suppose you could align to fire without having it agree with the dial below. Of course, something like this couldn't really be affordably mass-produced anyway.
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