Similar
Related
![[Small raft of blanket boats crossing the Potomac River]](https://cache.getarchive.net/Prod/thumb/cdn25/L3Bob3RvLzE4NjMvMDEvMDEvc21hbGwtcmFmdC1vZi1ibGFua2V0LWJvYXRzLWNyb3NzaW5nLXRoZS1wb3RvbWFjLXJpdmVyLWE4MjAxYi02NDAuanBn/40/34/webp "[Small raft of blanket boats crossing the Potomac River]")
![[Boat on Potomac River] - Glass negative photogrpah. Public domain.](https://cache.getarchive.net/Prod/thumb/cdn4/L3Bob3RvLzE5MjQvMDEvMDEvYm9hdC1vbi1wb3RvbWFjLXJpdmVyLTY0MC5qcGc%3D/40/29/webp "[Boat on Potomac River] - Glass negative photogrpah. Public domain.")
Head of navigation of the Potomac River / nautical chart
Summary
Relief shown by hachures. Depths shown by contours and soundings.
Photocopy of ms. map.
Oriented with north toward the upper left.
Includes notes.
LC copy originally printed on separate sheets, assembled to 1 sheet, thirded, mounted on cloth backing, accompanied by negative photocopy, and annotated in pencil: From negative transferred from War Department.
Available also through the Library of Congress Web site as a raster image.
DCP
The word portolan comes from the Italian adjective portolano, meaning "related to ports or harbors", or "a collection of sailing directions". Portolan charts are maps based on compass directions and estimated distances observed by the pilots at sea. They were first made in the 13th century in Italy, and later in Spain and Portugal where they considered to be state secrets. The English and Dutch found the description of Atlantic and Indian coastlines extremely valuable for their raiding, and later trading, ships. The oldest survived portolan is the Carta Pisana, dating from approximately 1296 and the oldest preserved Majorcan Portolan chart is the one made by Angelino Dulcert who produced a portolan in 1339.
Tags
Date
Contributors
Source
Copyright info
