Meteostation ...

Cleaning my c-disk I found an old picture I made a while ago of a sophisticated meteostation on a mountain in Switzerland - Prodkamm (1940 amsl). The hut ward uses the stone to see the weather + forecast it ? 

Some examples of the instructions for the weather stone include (from WIKI ):

• If the rock is wet, it's raining.
• If the rock is swinging, the wind is blowing.
• If the rock casts a shadow, the sun is shining.
• If the rock does not cast a shadow and is not wet, the sky is cloudy.
• If the rock is not visible, it is foggy.
• If the rock is white, it is snowing.
• If the rock is coated with ice, there is a frost.
• If the ice is thick, it's a heavy frost.
• If the rock is bouncing, there is an earthquake.
• If the rock is under water, there is a flood.
• If the rock is warm, it is sunny.
• If the rock is missing, there was a tornado.
• If the rock is wet and swinging violently, there is a hurricane.
• If the rock has white splats on it, watch out for birds.