3 ms·

Then it would only remove the excess, not the entire contents.

• SilasX 12y ago
  The linked design only removes the excess too.
  • arxanas 12y ago
    It seemed to me that the linked design removed the entire contents: "Hydrostatic pressure then creates a siphon through the central column, causing the entire contents of the cup to be emptied through the hole at the bottom of the stem."