Juan y Santacilia, Jorge (sold)
Jorge Juan y Santacilia (January 5, 1713 - June 21, 1773) was a Spanish mathematician, scientist, naval officer, and mariner. In collaboration with the French Geodesic Mission, he confirmed Newton's theory that the Earth is not perfectly spherical but is oblate, i.e. flattened at the poles. Juan also successfully measured the heights of the mountains of the Andes using a barometer. In 1749, he was sent to England to spy on British naval construction techniques, and was successful to the extend of bringing back to Spain with him fifty British naval constructors - many of whom would build the Spanish ships that would later fight the British in the American Revolutionary War and the battle of Trafalgar.
The First Scienific Survey of the Andes Mountains and Central Ecuador
Carte de la Meridiene mesurée au Royaume de Quito; Par ordre du Roy notre Souverain pour parvenir à la Connoissance du Dégré Teirestre et de la figure de la teire par D. Jorge Juan et D. Ant. de Ulloa en 1744./ Karte von der gemessenen Mittagslinie in dem Koenigreiche Quito Auf Befehl Sr. Koenigl. Majest. in Spanien zur Erkentniss des rechten Gehalts eines Erdgrades und der Gestalt der Erde von dem Hrn Georg Juan und dem Hrn Antonio de Ulloa im Jahre 1744 zu Stande gebracht.
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- Digital Map Information
- Suitable for large format printing
- DPI: 600
- File Size: 20.88 MB
- File Type: ZIP / TIFF
- ICC color profile embedded
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This is a rare, 1752 map of Ecuador's La Sierra region, from Carchi Province in the north to Cañar Province in the south. It encompasses one full degree of arc along the Quito meridian, and represents the first scientific survey of this high Andes valley. It appeared in the 1752 French and German editions of Antonio de Ulloa and Jorge Juan's Relacion Historica del Viaje a la America Meridional, a landmark work of South American geography, culture, history and science produced to report the two scientist's labors for the French Geodesic Mission, which were carried out in what is modern Ecuador over ten years. Specifically, the map shows the triangulations performed by Juan (his work indicated by solid lines) and Ulloa (dotted lines) during the expedition. It mapped Ecuador's Central Valley with unparalleled precision, marking rivers, towns and major peaks from El Angel, to Quito, to El Tambo. Towns of various sizes are differentiated with a key; relief is shown in hachure. Forests and plains are shown pictorially. Roads are marked with a dotted line, and bridges over rivers are indicated as well. (more details)