Several farmers from the area have jointly invested in this hail cannon. Firing the cannon (propane gas mixture) is intended to prevent hail from forming in the clouds. However, it is not scientifically clear whether the method actually helps.
Looks a bit strange, but is very interesting. It is explained on several display boards what the "cannon" is intended for and how it works. From here you also have a wonderful view over the lake to the Swiss Alps.