What is shown here is called the sundial cannon or noon cannon. The little bass cannon is mounted on a 9-inch marble base and has a magnifying glass that is positioned above it. When noon arrives, the lens can focus sunlight to light the cannon’s fuse to get it to fire.
Imagine if the cannon was loaded, it could be used to “shoot” the one who’s dozed off on his work desk before lunch break. What a great alarm clock that would dangerously but most effectively wake you up!
via ohgizmo
December 7th, 2009 at 8:57 am
[...] Bulbdial clock makes use of the sundial concept, which it has many LEDs to cast three shadows that form the three hands on the clock face. [...]