This image was acquired from
wikimedia. It was marked as Public Domain or CC0 and is free to use. To verify, go to the source and check the information there.
Keywords from Image Description:
Fotothek df tg Astronomie Sternkarte Messinstrument Schraube. Scan Deutsche Fotothek dftg color MIKCenter Berlin GmbH Abbildung Nr Oppenheim Stellschraube fr das Astrolabium Papier Holzschnitt cm Astronomie Sternkarte Messinstrument Schraube ppn Druck Deutsche Fotothek gefrdert von der Deutschen Forschungsgemeinschaft Projekt