Gravör av titelbladet till Atlas Novus av Tobias Conrad Lotter.
Bland arbeten.
Atlas Novus.
RdeT.
1756-1820.
King Gustav III's flag captain in a battle at Svensksund. Appointed state secretary for maritime affairs, later adjutant-general for the fleets. Fell out of favour and was demoted in 1801. When commandant of Sveaborg fortress in Helsinki in 1808, he ignominiously capitulated to the Russians.
Sveriges sjökartor – A. Hedin.
1680-1742. Född i Marieney, Sachsen, död i Dresden.
Tysk kartograf. Han studerade i Leipzig där han tog magistergraden. Studierna var egentligen teologi, men han ägnade sig hellre åt geometetri och mätning. Efter att år 1705 blivit präst, fortsatte han sina matematikstudier och företog lantmätningsarbeten i sin socken Skaffa i Sachsen. 1722 övergav han den andliga banan och ägnade sig helt och hållet åt geografi. Redan 1719 hade han gett ut en stor karta över Sachsen i 16 blad, kompletterat med ett band med upplysningar. Detta verk utkom i ett stort antal utgåvor. Ett annat viktigt verk var en stor specialatlas över Sachsen med 80 generalkartor. Detta verk utgavs först efter Zürners död. Allt som allt känner man till 900 kartor gjorda av honom. De flesta är specialkartor över tyska områden. Zürners kartor blev aldrig samlade i en komplett atlas utan finns spridda i ett antal geografiska verk. Han utgav även ett antal topografiska avhandlingar över tyska provinser.
Allg. d. Biogr.
Ingermanlandiae – Homanns Erben 1734
'Tjörn.' - Stockholm 1891.
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.
