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Traditional measuring cups have a straight line scale for determining the volume of content when the measuring cup is upon a level surface. However, the straight line scale is useless while pouring. We often repeat pouring movements in order to make sure we get the correct amount we want.
Therefore, the Rotating Invariant Volume Scale is a alternative volume scale which is a function defined by intersections of two different types of volume scales. The scale is not only used in ordinary condition, but also measurable while pouring. Users can pour and measure at the same time, and pour exact quantities of liquids in one movement.
Chia Hao Hung