What is a spiral wall clock?
It is quite rare to find clocks of this type,Nevertheless, they are very interesting and we can not pass by, although they can not call the language their own language (it's possible to do it manually, in general, but it's very difficult). The principle of operation is the following: the spiral is driven by a small mechanism, while the dial remains stationary. When the spiral is scrolled, the position of the ball changes - it moves upwards. The ball shows the time, which is indicated by the numbers on the dial (you can apply a minute scale). When he reaches the highest mark, he falls into ...