Scarce engraved sea chart of the coast of India, northeast from Vizagapatam (Visigapatam on the map).
The map includes details along the coast that suggest the firsthand surveying that went into its production. Soundings are given from harbor to harbor, effort has been put into annotating points of interest along the coast, clay ground anchorages are picked out, one bay is labeled "No good Anchoring in this Bay."
The present example of the map is from the 1734 edition of Mount & Page's publication of the English Pilot, the Third Book, which was the definitive English-language sea chart book for the voyage to the East Indies when it was first introduced in the 17th century. The English Pilot The Third Book, as well as the maps from it, is very scarce on the market; the last example to appear at auction was sold for over 150,000 euros.
This state of the map obliterates the imprint found below the title.
John Thornton (1614-1708) served as hydrographer to the Hudson Bay Company and East India Company. Thornton's two major atlas works were the Atlas Maritimus and the English Pilot in four books. The maps in these books reflected the knowledge he garnered in his respective appointments.