Interesting system on Isle of Man as ianh describes by having an off period of the streetlights between 1 a.m. and 6 a.m.
Is power here diesel generated??
How does that work out with crime and the likes? We have found in NZ when streetlights fail, the crime rate like grafitti etc increases. especially over a longer period.
The clocks with the "clever thingy" are called astronomical clocks. they have the actual time pins slide over the disc side and every 24 hours they move a few minutes / secs depending on the time of year. These also have a full clockwork mechanism which keeps them going for about 36 hours in case of power faillure.
The type we use are AEG 10/1 101.204ys. about 40 years old in case we have pilot problems. They have to be for the correct geographical time zone.
