A differential gravity tube is formed by incomplete mixing of two miscible liquids of different gravities. If it is done in a graduate cylinder or buret the graduations are easily changed to gravity units of density. This is done by putting materials of known density in the tube and they will assume a location in the tube according to the gravity of the liquid at the spot where they float. It can be done with test minerals of known gravities or with synthetic materials impervious to the solvent characteristics of the liquids used. Synthetic materials are more easily obtained without air entrapped within them and also can be readily obtained in thin flat form which float in a horizontal plane to give accurate readings that are easy to take. Also they are readily available in quantity at low cost.

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