1653-1715.
In 1680 was given special endorsement from the Dutch state to print and publish sea charts and sailing instructions. The van Keulen family's best-known work is Nieuwe Groote Ligtende Zee-Fakkel a world atlas in five volumes, published by Johannes's son Gerard and subsequently by Gerard's children and grandchildren.
As we have noted in other biographies in this chapter, the Dutch produced a remarkable number of enterprising and prolific map and chart makers but not even the Blaeu and Jansson establishments could rival the vigour of the van Keulen family whose business was founded in 1680 and continued under their name until 1823 and in other names until 1885 when it was finally wound up and the stock dispersed at auction. Throughout the history of the family, the widows of several of the van Keulens played a major part, after their husbands' deaths, in maintaining the continuity of the business.
The firm was founded by Johannes van Keulen who was registered as a bookseller in Amsterdam in 1678. In 16...
Sveriges sjökartor – A. Hedin.
Född 1809, död 1850.
Kartograf och officer. Son till Pierre Lapie. Alexander Emile Lapie gjorde en militär karriär och blev kapten i samma gardesregemente som sin far. Fader och son samarbetade även som kartografer, bland annat med 'Atlas Universel de Geographie Ancienne et Moderne' Paris 1838.
Bland arbeten.
Atlas Universel de Geographie Ancienne et Moderne.
1561-1623. Född i Liège, död i Frankfurt a. M.
Tysk kopparstickare. Bror till BRY, JOH. ISRAEL. Han var en talangfull kopparstickare, som förutom en rad enkla blad (däribland ett porträtt av Mercator), även utförde illustrationer till resebeskrivningar, samt anatomiska och andra vetenskapliga verk.
Thieme-Becker.
Karta öfver Stockholm. - 1904.
Konungens Svea lifgarde. - J. Mankell 1864.
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.
