Frontispice, Petrus Apianus, Introductio geographica, 1532. Mesurer les angles avec Jacob. Le terme contre-personnel est utilisé pour désigner plusieurs choses. Les deux utilisations les plus fréquentes sont : dans l'astronomie et de navigation pour un appareil simple pour mesurer les angles, une

• Contributeur: Science History Images / Alamy Banque D'Images
• ID de l’image: G16A27
• Taille du fichier: 21,5 MB (916,8 KB Téléchargement compressé)
• Autorisations: Modèle - non | Propriété - non
• Dimensions: 3019 x 2494 px | 25,6 x 21,1 cm | 10,1 x 8,3 inches | 300dpi
• Photographe: Photo Researchers

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Frontispiece, Petrus Apianus, Introductio geographica, 1532. Measuring angles with Jacob's staff. The term cross-staff is used to refer to several things. The two most frequent uses are: in astronomy and navigation for a simple device to measure angles, and in surveying for a vertical rod that penetrates the ground and supports a compass or other instrument. The cross-staff consisted of a long staff with a perpendicular vane which slides back and forth upon it. The staff is marked with graduated measurements - calculated by trigonometry. The angles can then be measured by holding it so the ends of the vane are level with the points to be measured. Early in the sixteenth century it was already in use as a seaman's navigational instrument. Petrus Apianus (April 16, 1495 - April 21, 1552) was a German humanist, known for his works in mathematics, astronomy and cartography. He died in 1552 at the age of 57.

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