The chart is beautifully composed, with nine delicately engraved coastal views. The topography of the islands is depicted with fine hachure, and good anchorages of each of the islands are marked.
This chart combines the data of the French hydrographer Charles Pierre Claret, Comte de Fleurieu (July 2, 1738 - August 18, 1810) with that of the Spanish hydrographer Vincente TofiâÂ±o de San Miguel (September 6, 1732 - 1795), whose respective surveys represented the first scientific charting of the Azores. It represents a vast improvement upon the 1755 Bellin Carte Reduite des Isles Acores , which until 1791 appears to have represented the best prior French charting of the islands. The main source for the chart's topography and place names is Vincente TofiâÂ±o de San Miguel's 1788 Carta esferica de las Islas de los Azores o Terceras , whose detail appears for the most part to be identical to this. A bank between the islands of Tercera and St.Michael has been added, as well as a small island southeast of the Formigues islands spotted by French mariners in 1788. This chart employs rhumb lines where the TofiâÂ±o uses latitude & longitude lines. The most significant visual difference between the TofiâÂ±o and the Depot are the latter chart's nine beautifully engraved coastal views.
These all are far superior to those found on the 1755 Bellin, and show the benefit of more recent survey. Claret de Fleurieu's contributions to the map are dated 1769, during which period he was in command of the frigate Isis, engaged in testing the new, secret, marine chronometers produced by Ferdinand Berthoud in an effort to determine longitude at sea.The chronometers were employed throughout the voyage, which set out from Rochefort in 1768 and made for the Saint Domingue by way of the Azores. The measurements taken of the Azores during this period represented the first, scientific, charting of those islands using modern instrumentation (and proved the efficacy of the French marine chronometers in navigating the transatlantic crossing). The French data has been applied to the more recent Spanish chart, and used to confirm the accuracy of both, as is explained in the chart's text (here translated from the French): The slight difference, or rather the agreement, which is found between the results of the observations of M. Tofino, reported in the table below, assures the position of all these islands with respect to Angra. We have taken the middle between these results to establish their longitude on the map: we have adopted the latitudes given by M. Tofino, and the configuration, as well as the understanding of the islands, has been taken from the map which he has published. We have identified seven examples of this chart in institutional collections. We are not aware of any further issues or changes in state of this chart. Size: Printed area measures 22.25 inches high by 33.25 inches wide. Few marginal mends with no loss to printed image. If your address is a P. Duty varies by country and we cannot predict the amount you will be charged. Some countries are duty free, others are not. Other Services Conservation Framing: Geographicus recommends basic conservation framing services for any antique paper. We do not offer this service. Antique Map Restoration: Geographicus can repair and restore your antique map.
Services include deacidification cleaning flattening and backing. The item "1791 Depot de Marine Chart / Map of the Azores with Coastal Views" is in sale since Thursday, November 28, 2019.
This item is in the category "Antiques\Maps, Atlases & Globes\Africa Maps". The seller is "geographicusmaps" and is located in 11221. This item can be shipped worldwide.