Frontispiece to the Introductio geographica, by Petrus Apianus, 1532. The illustration depicts the use of a cross-staff, or Jacob's staff, to measure angles. The instrument was used in astronomy, navigation, and surveying. | |
Lizenzart: | Lizenzpflichtig |
Credit: | Science Photo Library / Science Source |
Bildgröße: | 3019 px × 2494 px |
Modell-Rechte: | nicht erforderlich |
Eigentums-Rechte: | nicht erforderlich |
Restrictions: | - |