A microscope with universally movable tube has been designed in order to facilitate the examination of crystal grains of varying orientations for the determination of their refractive indices, using the dispersion method.1 The Fedorov universal stage, which is extremely useful for the examination of mounted mineral sections, is not suitable for the examination of mineral grains immersed in a liquid2 as the liquid will flow and the grains shift their positions upon inclining the stage. The device of a movable microscope tube aims primarily to apply the methods of the universal stage to grains immersed in a liquid.

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