Magnetic chart of the Atlantic. Chart of the Atlantic Ocean showing variations in compass readings, originally published in 1700 (see E056/0100) by th
Magnetic chart of the Atlantic. Chart of the Atlantic Ocean showing variations in compass readings, originally published in 1700 (see E056/0100) by the English astronomer, meteorologist and physicist Edmond Halley (1656-1742) and here updated and reissued after 1744. In 1698 and 1699 Halley, most famous for his work on comets, was given command of a ship by King George III and told to record geographical variations in compass readings (the amount the horizontal alignment of the needle differs from geographical North) as a way for sailors to determine longitude. The lines, known as isogonic lines, show places where the magnetic variation is equal.
Size: 5079px × 4138px
Photo credit: © Stephen A. Schwarzman Building/The Lionel Pincus and Princess Firyal Map Division/NEW YORK PUBLIC LIBRARY/SCIENCE PHOTO LIBRARY / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: -, ., 1700, 1700s, 1740s, 1744, 18th, ancient, artwork, atlantic, black, cartography, century, chart, compass, diagram, edmond, edmund, geographical, geography, halley, halleys, historical, history, illustration, isogenic, line, lines, longitude, map, mapping, maps, maritime, meteorological, meteorology, monochrome, mount, naval, navigation, navigational, ocean, oceanography, page, printed, readings, reissued, research, sea, text, updated, variation, weather, white, writing
