La Cassini map, the first detailed map of the Kingdom of France, represents an invaluable cartographic treasure from the 18th century. This monumental project, led by four generations of scholars, offers a fascinating vision of French geography in the past.
Today, Conspiration | Editions has undertaken the task of reproducing this work in an exceptional book, allowing everyone to admire this ingenious masterpiece in an original format.
History and origins of the Cassini map
The first attempts at mapping
The beginnings of cartography in France date back to the 16th century, with attempts to draw up more precise maps of territories. However, these maps often lacked precision and detail, limiting their usefulness for administrations and the military.
The Cassini Initiative
The Cassini family, comprised of four generations of astronomers and mathematicians, dedicated themselves to creating the first detailed map of France. This undertaking, begun under Louis XV, combined advanced triangulation methods and precise topographical surveys to provide a unique representation of the kingdom.
Giovanni Domenico Cassini, the patriarch of the family, laid the foundations for this ambitious project. His work in astronomy and geodesy led to the development of precise techniques for measuring distances and angles.
Jacques Cassini, son of Giovanni, continued his father's work by improving triangulation techniques and producing the first partial maps of France.
César-François Cassini de Thury, Giovanni's grandson, is the true architect of the Cassini Map. He oversaw the creation of the 181 sheets that make up this map, using state-of-the-art calculation and drawing methods for the time.
Features of the Cassini map
A monumental work
The Cassini Map consists of 181 sheets, representing the entire Kingdom of France. Each sheet, enhanced with watercolors, measures approximately 1,1 meters wide by 1,2 meters high. The complete map thus reaches over eleven meters wide and twelve meters high.
This map is distinguished by its exceptional level of detail. Landscapes, cities, roads, and waterways are depicted with unparalleled precision for the time. Each cartographic element is drawn with a meticulousness that demonstrates the Cassini family's expertise.
The Queen's Version
The version of the Cassini Map reproduced by Conspiration | Éditions is the so-called "Queen's Map." Housed at the Bibliothèque nationale de France, this version is particularly notable for its vivid colors and improved readability. Each sheet has been hand-colored, adding an aesthetic dimension to this scientific work.
The reissue by Conspiration | Editions
This exceptional book is a complete reissue of Cassini's map, respecting the original scale and the details of each sheet. This book, of extraordinary dimensions, is a true work of art, measuring 57 x 66,5 cm closed and 117 x 66,5 cm open, weighing nearly 24 kg. It is limited to 250 numbered copies.
This reissue took two years of work, including a meticulous examination of the original pages to reconstruct the legend. Jean-Luc Arnaud, historian and scientific director of the publication, led this project with academic rigor, ensuring the accuracy and fidelity of every detail.
Intended primarily for academic institutions, museums, and private collectors, this book has already been acquired by prestigious institutions such as the Université de Paris-Cité, Harvard, Cambridge, and Stanford. Its value lies as much in its rarity as in the wealth of its historical and cartographic information.
Impact and legacy of the Cassini map
The Cassini Map has been a benchmark in cartography for over a century. It served as a model for other cartographic projects in Europe and around the world, influencing survey techniques and methods.
Today, the Cassini Map is a valuable resource for historians, geographers, and researchers, allowing them to study the evolution of landscapes, infrastructure, and human settlements in France during the 18th century.
For collectors, owning a copy of the Cassini Map reissue is a unique opportunity to acquire an exceptional piece of heritage. Each copy, with its altuglas lectern designed by Olivier Maupin, is a collector's item in its own right.
Patrick Koune
Photos: Conspiracy | Editions
