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Rare 2-sheet sea chart of the Atlantic and eastern part of North America., published by Gerard Van Keulen.

'The map extends from the latitude of Newfoundland and the English Channel in the north to the Equator in the south.

Van Keulen's sea chart includes dozens of place names along the coastlines. Along the Eastern Seaboard, the map extends from Newfoundland to the equator, including the northern coast of South America and the Caribbean Islands. In North America, the majority of the Great Lakes are shown, along with an exaggerated Long Island (Long I. ou Jork Shire) and a large lake (Apalache Lac) in South Carolina.

Florida is presented in a triangular shape, with large islands forming the tip and numerous soundings along the coast. The coasts of Britain, France, Spain and western Africa are shown in the eastern hemisphere. A large cartouche contains the title in Dutch, French and English and four compass roses complete the composition.

This chart is an example of one of Gerard Van Keulen's sea charts, published after the Van Keulen firm began to substantially expand the coverage and detail of their sea chart business in the early 18th Century. Because Van Keulen charts were typically working sea charts, they tend to be much rarer than charts issued by the Van Keulen family prior to 1700.

As noted in the Maphist history page:

The Van Keulen family operated a chart-making and publishing firm in Amsterdam for nearly 200 years. It was founded by Johannes Van Keulen who registered his business as a "bookseller and cross-staff maker." Under his management the Nieuwe Lichtende Zee-Faakel (New Shining Sea Torch) was begun in 1681. It was expanded to five volumes and finally to six volumes with the addition of material from the secret files of the East India Company. In 1693 Van Keulen acquired the stock of Hendrik Doncker.

In 1678, Johannes registered with the Amsterdam Booksellers Guild as a "bookseller and Cross-staff maker." By this time, most of the Amsterdam chart makers and instrument makers, like Blaeu, Janssonius, Hondius, Goos and Doncker, had either closed down or were at the end of their fame. As a result, Johannes Van Keulen had the opportunity to obtain copperplates, privileges and stocks of many of his former competitors. Besides manuals and cross-staffs, Johannes produced his famed "ZeeAtlas"(Sea Atlas, 5 volumes) and "ZeeFakkel" (Sea pilotbook, 5 volumes). ZeeFakkel was produced in numerous languages, including English, French, Italian and Spanish.

Gerard Van Keulen, son of Johannes, born 1678, took over from his father in 1714 and continued to expand the flourishing firm. Gerard's accomplishments include hundreds of manuscript charts, which are now kept in a number of European collections. In 1726, Johannes Van Keulen, son of Gerard, took over the business. In 1743, Johannes was appointed "Official Chartmaker of the Dutch East Indies Company". The title appears to be nothing more than a formality, however, since the firm had been supplying charts to the East Indies Company for many years prior and considering that the Van Keulen family of Amsterdam had an interest in the East Indies Company. Still, Van Keulen Chartmakers held the official title, until the East Indies Company was dissolved in 1799.

In 1753, Johannes finished his grandfather'' work, by publishing the sixth volume of "ZeeFakkel". This volume contained the previously kept secret cartography of The East India Archipalago. Jan de Marre, examiner of the Amsterdam Chamber of the East Indies Company, provided Van Keulen with the data for the ZeeFakkel sixth volume and it is also believed that de Marre was involved in the Van Keulen chartmakers decision to start production of the newly invented Hadley's Octants in 1744.

Following the death of Johannes Van Keulen(1770), the company was run by his widow and their two sons, Cornellis Buys and Gerard Hulst Van Keulen. By this time, they also owned an anchor factory, which was managed separately.

In 1778, with the death of brother Cornellis, Gerard Hulst Van Keulen would assume the head of the chartmaker firm, adding sextants to their inventory for sale. Gerard was one of the three original members of the "Dutch Commission for Longitude at Sea", installed by the Dutch Admiralty in 1787. In 1788, Gerard Van Keulen published the first "Dutch Nautical Almanac" and annual publication of same continued until 1885.

When Gerard Hulst Van Keulen died in 1801, his widow ran the firm until her death in 1810, at which time Johannes Hulst Van Keulen became the last Van Keulen to run the firm. In 1823, Jacob Swart entered the service of the Van Keulen firm and in 1844, with the death of Johannes Hulst Van Keulen, head of the Van Keulen Chartmakers was passed to Jacob Swart. When Jacob died in 1866, he was succeeded by his son, Jacob Swart, Jr. Under Jacob, Jr's reign, the firm lost all of its standing in the Nautical world and the possessions of the firm were sold at auction in 1885, bringing 200 years of "DeGekroonde Lootsman" to an end. Detailed pair of sea charts of the Eastern and Western Mediterranean, from the leading Dutch chart maker of the 18th Century.