El Ex.mo S.or D.n Jorge Juan.
Engraving, paper watermarked. Plate 254 x 184mm (10 x 7¼").
Jorge Juan y Santacilia (1713-1773) the Spanish mathematician, scientist, naval officer and mariner. In 1734, King Philip V of Spain asked Juan and fellow scientist Antonio de Ulloa to join the French Geodesic Mission organised by the French Academy of Sciences from Paris, under the command of the astronomer Louis Godin. The mission was to measure the length of a degree of meridian arc at the Equator in South America and to determine the roundness of the Earth. He discovered that the Earth is not perfectly spherical but is oblate. He also successfully measured the heights of the Andes using a barometer. For his work and discoveries in Ecuador and Peru he was elected a Fellow of the Royal Society. In 1757 he founded the Royal Astronomical Observatory of Madrid. Print based upon the bust portrait made by the sculptor Felipe de Castro for Jorge Juan's tomb in the church of St Martin, Madrid.
[Ref: 29912] £120.00