A career at the pinnacle of royal geography
Born in Paris on February 7, 1700, Philippe Buache began his career as an apprentice and assistant in the cartographer's workshop Guillaume Delisle. After the latter's death in 1726, he took over the publishing business and married his mentor's only daughter. In 1729, he was appointed First Geographer to the King, succeeding Giacomo Filippo Maraldi. The following year, he became Assistant Geographer of the Royal Academy of Sciences, a title created specifically for him. Throughout his life, he worked to organize and publish the research left by Guillaume Delisle, while producing his own original works.
Technological innovations and physical geography
Philippe Buache is particularly respected for introducing hatching, a method for representing underwater elevation on a flat surface. In 1752, he presented his "Essay on Physical Geography" to the Academy, where he outlined his vision of the world organized around major mountain ranges traversing the globe, both on land and under the seas. His maps were based on scholarly research, explorers' journals, missionary accounts, and direct astronomical observations. Among his notable works are the "Physical Planisphere Showing from the North Pole What We Know of Lands and Seas" (1756) and a "Mineralogical Map" created with Guettard in 1746.
Speculative geography and controversies
At a time when vast regions remained unexplored, notably the American Northwest and the poles, Buache practiced what is known as "speculative geography" or "positive geography." This approach consisted of filling in the blank areas on maps with geographical theories and sometimes dubious sources in an attempt to validate the unknown with the known. This practice generated intense rivalries, particularly with Didier Robert de Vaugondy. His work on the "Western Sea" and his theories on the polar continents fueled many debates within the Academy of Sciences until the explorations of the late 18th century by Cook or La Pérouse.
Cartographic Heritage and Successions
During his career, Philippe Buache produced over 1,500 maps. He notably worked on hydrographic plans of Paris, maps of French Guiana after the Treaty of Paris of 1763, and corrected maps of the Gulf of Mexico. Upon his death in Paris on January 24, 1773, his nephew Jean-Nicolas Buache de Neuville succeeded him. His work continued to be disseminated and updated by publishers such as Dezauche, extending the influence of the French school of geography that emerged from the workshops of Delisle and Buache.
