Sundial Alarm Clock Goes off with a Bang...
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 i...
http://www.neatorama.com/2012/11/28/Sundial-Alarm-Clock-Goes-off-with-a-Bang/
