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The Greedy Cup

by TJProjects Jul 3, 2019
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I remember reading about and building a special sprout growing box that included what the writer called a "Tantalus Cup" with a curved tube inside, which would empty the cup when it was filled to a specific line. This may be the same thing. I built one from a copper tube bent in a hook inside a bowl, then sealed at the bottom. It starts to empty when the hooked tube is completely submerged, and quits when the water level gets down past the tube opening.