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Robert Norman
Robert Norman was a 16th-century-English mariner, compass builder, and hydrographer who discovered magnetic inclination, the deviation of the Earth's magnetic field from the vertical.
== Work ==
Robert Norman is noted for ''The Newe Attractive'', a pamphlet published in 1581〔Published in London by Ballard. See 〕 describing the lodestone (magnet) and practical aspects of navigation. More importantly, it included Norman's discovery of magnetic dip, the incline at an angle from the horizon by a compass needle. This effect is caused by the Earth's magnetic field not running parallel to the planet's surface. Norman demonstrated magnetic dip by creating a compass needle that pivoted on a horizontal axis. The needle tilted at a steep angle relative to the horizon line.
Magnetic inclination and local variations were known before Robert Norman, but his pamphlet had a greater influence than the earlier work.
The crater Norman on the Moon is named in his honour.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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