Singapore Nautical Chart, an exceptionally rare nautical chart of Singapore issued under the patronage of Louis Philippe I of France. Published in the year 1846 by Urban Dortet de Tessan. Tessan's map covers from the southern tip of the Malay peninsula to the coast of Sumatra and from (roughly) Panjore to Tanjong Bon and eastward as far as the Kepulauan Riau and Riau Islands. It details the Bantam Islands, including Batnam, Pulau Bulan, and Pulau Brintan.
The focus of the map is the newly surveyed maritime routes south of Singapore, via the straits of Durian and Rhio (Riouw), towards the Dutch trading centers in Jakarta and the Pepper Ports of Sumatra. While inland detail is limited, the street structure of Singapore City is evident, as are some notable inland features, such as mountains and volcanoes. Profile charts appear in the lower-left quadrant.
The whole exhibits a level of meticulousness and detail rarely apparent in earlier charts of the region and is technically superior to the better documented British charts, such as the Thompson chart of 1846. The islands to the south remain loosely mapped, with some shorelines only ghosted in and other left notably blank, 'Partie inconue.' Nonetheless, significant advancement can be seen in the detailed sounding through in the Detroit de Rhio (Roiuw), the Detroit de Bolang, and the Detroit de Durian.
This chart is unattributed but bears enough similarity to other charts of the region that we can definitively attribute it to Urban Dortet de Tessan. Dortet de Tessas was, at the time this chart was made, employed as a hydrographic engineer by the Depot de la Marine.
A unique acquisition opportunity for the Singapore collector.
When Singapore was founded in 1819 the seas around the colony were only tentatively mapped. The Malacca Straits, which had long been a major artery of trade, had been mapped, but within proximity of Singapore island, most early mappings fell apart. This chart follows on the work of Horsburgh, supplemented by new surveys initiated by the Admiralty in 1840. Additionally, it also drawn on Dutch surveys produced by Dittlof Tjasssens, Bloijs, Van Treslong Prins, and Van Gogh under the direction of M. Van der Plaat. Van der Plaat surveyed the islands just south of Singapore later in the same year. The consolidation of these various efforts under Dortet de Tessan represents a considerable advancement over both previous charts.
Urban Dortet de Tessan (August 25, 1804 – September 30, 1879) was a French physicist and Hydrographer Engineer active in Paris during the early to middle part of the 19th century. Tessan was considered among the most scientific of cartographers active at the time and his work is notable for its meticulousness and precision. Tessan was born I Vigan, the scion of an old Languedoc family. He graduated from the École Polytechnique in 1825. Afterwards he completed detailed surveys of the coast of France. From 1836 to 1839 he traveled around the world making scientific observations on the frigate Venus under the command of Abel Aubert Dupetit-Thouars. Tessan published several important works on physics, hydrography, astronomy, and more. Some of his more significant research presaged the invention of sonar over one hundred years later.
Dépôt des Cartes et Plans de la Marine (fl. 1720 - present), often called the Dépôt de Marine, was a French hydrographic mapping organization founded in 1720 under Charles-Hercule of Albert de Luynes (1674 - 1734). Much like the U.S. Coast Survey, the British Admiralty, and the Spanish Deposito Hydrografico, the Dépôt was initiated as a storehouse and distribution center of existing nautical and marine charts. Eventually the Dépôt initiated its own mapping activities in an attempt to improve and expand upon existing material. Some of the more prominent cartographers and hydrographers associated with the of Dépôt des Cartes were, Philippe Buache, Jacques-Nicholas Bellin, Giovanni Rizzi-Zannoni, Rigobert Bonne, and Jean Nicolas Buache.