3D scans of four models of water caltrop fruits. The models were created around 1803 most likely by Franz Stoll or Johann Jaich, who were employed at the Naturalien-Cabinet, the predecessor of the Natural History Museum Vienna, ...

3D scan of a hydrometric current meter. The instrument was used for flow velocity measurements in rivers and streams by the Karst and Cave Department (Geology and Palaeontology).