What is a spiral wall clock?
It is quite rare to find watches of this type,Nevertheless, they are very interesting and we cannot pass by, although we cannot call them homemade (in general, it is possible to make them manually, but it is very difficult). The principle of operation is as follows - the spiral is set in motion by a small mechanism, while the dial remains stationary. When the spiral is scrolled, the position of the ball changes - it moves up. The ball shows the time, which is marked with numbers on the dial (you can also apply a minute scale). When it reaches the highest mark, it falls into...