Practical trigonometry. 17th century woodcut illustration showing the use of a cross-staff and quadrant for measuring distances. Here an observer is using the known width of a well to measure its depth. This illustration was first published in Quaestiones geometricae by Peter Ryff,printed at Frankfurt in 1621 | |
Licence : | Droits gérés |
Crédit: | Science Photo Library / Middle Temple Library |
Taille de l’image : | 3777 px × 4724 px |
Model Release : | Non requis |
Restrictions : | - |