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Plano del Puerto Egmon situado en la costa del norte de la Gran Malvina por la latitud sur de 57 grados 24 minutos y en la Longitud de 317 grados 17 minutos, meridiano de Thenerife y segun la occidental de Londres por la de 59 grados /
Summary
Relief shown pictorially. Depths shown by soundings.
Prime meridians: Tenerife and London.
Oriented with north to the bottom.
Watermarks: IV; and, fleur-de-lis over the characters VDL.
Pen-and-ink.
Mounted on cloth backing.
LC Luso-Hispanic World, 418
Available also through the Library of Congress Web site as a raster image.
Includes index and note.
Annotated in black ink: N. 14 [indecipherable].
Maggs number annotated in pencil in lower right margin: 140.
Vault
In the 17th century, maps took a huge leap forward. Mathematical and astronomical knowledge necessary to make accurate measurements had evolved. English mathematicians had perfected triangulation: navigation and surveying by right-angled triangles. Triangulation allowed navigators to set accurate courses and produced accurate land surveys. Seamen learned to correct their compasses for declination and had determined the existence of annual compass variation. Latitude determination was greatly improved with the John Davis quadrant. The measurement of distance sailed at sea was improved by another English invention, the common log. Longitudinal distance between Europe and Québec was determined by solar and lunar eclipses by the Jesuit Bressani in the 1640s and by Jean Deshayes in 1686. With accurate surveys in Europe, the grid of the modern map began to take shape.
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