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A) Mark the level of the water. B) Invert the cylinder, and mark the level of the water again. # If the second mark is above the first mark, take out some water and remove the old marks # If the second mark is below the first mark, add some more water and remove the old marks

C) Repeat Steps A & B until the two lines correspond. - - Alternately - - Fill the cylinder and tip it to one side so that the top of the bottom circle is level with the bottom of the top cylinder, this will empty much of the water out of the barrel. When the level of the water just covers the top of the bottom circle and just reaches the bottom of the top circle, the barrel is half-full.

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