Gravör. Arbetade åt Robert Sayer.
Bland arbeten.
Sayer & Bennett's General Atlas 1757-94.
Carl Van Verden (fl. c. 1718 - 1730) was a Dutch seaman in the employ of the Russian Navy during the early 18th century. Van Verden is best known for his important 1719 - 1721 mapping of the Caspian Sea, which was the most sophisticated and accurate that had been issued to date. A significant cartographic achievement, Van Verden's work on the Caspian led directly to Peter the Great's 1722 invasion of Baku and Derbent and Russian hegemony in the region. Despite his achievements in the Caspian, Van Verden was later passed up by the Tzar in favor of Vitus Behring for the commission to discover a Northeast Passage through the Russian Arctic.
Around 1718 the Russian Tzar, Peter the Great, sponsored a number of cartographic expeditions to the farthest reaches of his vast empire. Most of these were headed up by Dutch navigators, the most experienced and mercenary of the era. Carl Van Verden, a Dutch seaman, was commissioned as a Russian naval officer and assigned the task of mapping the Caspian Sea. Though we...
Bland arbeten.
Carte Marine de la Mer Caspiene.
1758-1829. Född och död i Köpenhamn.
Dansk sjöofficer. 1776 officer, 1789 kaptenlöjtnant, 1797 kapten och 1803 generalkrigskommissarie. Han deltog 1786 i Poul Lövenorns (se denne) expedition till Grönland, och beordrades 1787-1800 att leda arbetet med kartläggningen av den norska kusten från Tröndelag till Svinesund. Medlem av en rad sjömilitära kommissioner, Amiralitetskollegiet m.fl.
Bricka.
Vägvisare för XI Olympiaden i Berlin - 1936
Dalman - C. H. Tersmeden ca 1900.
Cassini de Thury, César-François
Biografiska uppgifter:17 June 1714 – 4 September 1784
César-François Cassini de Thury (17 June 1714 – 4 September 1784), also called Cassini III or Cassini de Thury, was a French astronomer and cartographer.
Cassini de Thury was born in Thury-sous-Clermont (Oise), the second son of Jacques Cassini and Suzanne Françoise Charpentier de Charmois. He was a grandson of Giovanni Domenico Cassini, and would become the father of Jean-Dominique Cassini, Comte de Cassini.
In 1735, he became a member of the French Academy of Sciences as a supernumerary adjunct astronomer, in 1741 as an adjunct astronomer, and in 1745 as a full member astronomer.
In January, 1751 he was elected a Fellow of the Royal Society.
He succeeded to his father’s official position in 1756 and continued the hereditary surveying operations. In 1744, he began the construction of a great topographical map of France, one of the landmarks in the history of cartography. Completed by his son Jean-Dominique, Cassini IV and published by the Académie des Sciences from 1744 to 1793, its 180 plates are known as the Cassini map(fr).
The post of director of the Paris observatory was created for his benefit in 1771 when the establishment ceased to be a dependency of the French Academy of Sciences.
His chief works are: La méridienne de l’Observatoire Royal de Paris (1744), a correction of the Paris meridian; Description géométrique de la terre (1775); and Description géométrique de la France (1784), which was completed by his son ('Cassini IV').
César-François Cassini de Thury died of smallpox in Paris on 4 September 1784,
The Cassini projection is a map projection described by César-François Cassini de Thury in 1745. It is the transverse aspect of theequirectangular projection, in that the globe is first rotated so the central meridian becomes the 'equator', and then the normal equirectangular projection is applied.
In practice, the projection has always been applied to models of the earth as an ellipsoid, which greatly complicates the mathematical development but is suitable for surveying. Nevertheless the use of the Cassini projection has largely been superseded by the Transverse Mercator projection, at least with central mapping agencies.
Areas along the central meridian, and at right angles to it, are not distorted. Elsewhere, the distortion is largely in a north-south direction, and varies by the square of the distance from the central meridian. As such, the greater the longitudinal extent of the area, the worse the distortion becomes.
Due to this, the Cassini projection works best on long, narrow areas, and worst on wide areas.
