A Schlieren optics device like the one in this photograph is used to monitor sedimentation by measuring refraction as light passes through a solution.
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“Man Using a Schlieren Optics Device for a Spinco Preparative Centrifuge,” n.d. Beckman Historical Collection, Box 59, Folder 134. Science History Institute. Philadelphia. https://digital.sciencehistory.org/works/4b29b608f.
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