When plate is "full" of water the rods/pipes are above water level in (tube like) container and water doesn't flow. But when the plate is (almost) empty the pipes are heavier and they go down and water can flow from container to plate.Can you tell me more about that contraption?
Interesting to read and knew about such interesting things.I use a plastic chicken waterer with stones or sticks in it to keep them from drowning. If it is not during honey flow, you can first put out sugar syrup and they will find it! Then change to water and they will use it from then on. One of my apiaries goes through 3 gallons a day in the summer.