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Slurry Warning System
Walter Wright's invention is designed to solve the problem of trying to tell how much room is left in a big slurry tank without having to climb up and take a look.
  He simply fitted a 9-in. dia. ballcock (like you find in a toilet tank) on a rod attached to a pivot point. A large red-colored "lollipop" shaped disc attaches to the other side of the pivot. The boyant ballcock rises as the slurry nears the top, raising the lollipop alarm high into the air. It's easily visible, even from a nearby farm road. (Walter Wright, Greenfield Farm, Straneraer, Wigtownshire, Engloand)

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2000 - Volume #24, Issue #2