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Halley's magnetic Atlantic chart, 1700

Halley's magnetic Atlantic chart, 1700

E056/0100

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Credit

ROYAL ASTRONOMICAL SOCIETY / SCIENCE PHOTO LIBRARY ROYAL ASTRONOMICAL SOCIETY / SCIENCE PHOTO LIBRARY

Caption

Halley's magnetic Atlantic chart. Chart of the Atlantic Ocean showing variations in compass readings, published in 1700 by the English astronomer, meteorologist and physicist Edmond Halley (1656-1742).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. For an updated map after 1744, see image C023/8607.

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