This is a Congreve Rolling Ball clock that is on display at the British Museum in London. It tells time by a ball that rolls back and forth along a zig-zag track, but because of the way its made, it does cause some inaccuracies in time.
have you seen this New York, NY, United States
I come across things day to day, time to time, that hopefully you will stumble upon and enjoy. Please feel free to send me interesting / fabulous / amazing things you come across. If you see something you like, please stumble / reddit / digg it so others can find it and enjoy it too. ♥