magnetic variationn.

Brit.

/maɡˌnɛtɪk ˌvɛːrɪˈeɪʃn/, U.S.

/mæɡˌnɛdɪk ˌvɛriˈeɪʃən/

Forms: see magnetic adj. and variation n.

Origin: Formed within English, by compounding. Etymons: magnetic adj., variation n.

Etymology: < magnetic adj. + variation n.

1. Nautical and Surveying. = variation n. 5a.

ΘΚΠ

society > travel > travel by water > vessel, ship, or boat > equipment of vessel > navigational aids > [noun] > compass > variation

north-easting1555

variation of the compass, (lodestone,) or needle?a1560

norwesting1561

north-westing1571

variation1595

declination1625

magnetic variation1696

variation of the variation1706

magnetic declination1787

1696 E. Harrison Idea Longitudinis v. 26 I desire the Ingenious Seamen [sic], that the knowledge of Magnetick Variation, may be always in his great Esteem.

1794 R. Walker Memorial to Board of Longitude 3 I..constructed an instrument for the purpose of shewing the quantity of the magnetic variation in all latitudes and longitudes, at any time of the day when the sun was visible, without making any use of the horizon, or any calculation whatever.

1854 in E. K. Kane Arctic Explor. (1856) II. 349 The latitude of our camp this night was 78°44′; and the magnetic variation to-day was 111°S.W.

1991 Motorboat & Yachting June 83/3 The plotting head incorporates correction for magnetic variation on a similar principle to a Breton Plotter.

2. Geology and Meteorology. A change (over time or space) in the earth's magnetic field.

ΘΚΠ

the world > matter > physics > electromagnetic radiation > magnetism > earth magnetism > [noun] > local variation

magnetic anomaly1899

magnetic variation1937

1937 Proc. Imperial Acad. (Tokyo) 13 34 (heading) Sudden magnetic variation during the volcanic activity of Asamayama.

1965 A. Holmes Princ. Physical Geol. (rev. ed.) xxvii. 989 The main field is constantly changing at easily measurable rates. The secular magnetic variations, as they are called, are recorded at various observatories where the details necessary to determine the total magnetic field and its parts are continuously measured.

1984 Jrnl. Geophysical Res. 89 8335/1 Magnetic variation measurements offer an effective reconnaissance tool for rapidly identifying the spatial behaviour of large scale electrical current systems in the lithosphere.

This is a new entry (OED Third Edition, March 2000; most recently modified version published online March 2022).

单词	magnetic variation
释义	magnetic variationn. Brit. /maɡˌnɛtɪk ˌvɛːrɪˈeɪʃn/, U.S. /mæɡˌnɛdɪk ˌvɛriˈeɪʃən/ Forms: see magnetic adj. and variation n. Origin: Formed within English, by compounding. Etymons: magnetic adj., variation n. Etymology: < magnetic adj. + variation n. 1. Nautical and Surveying. = variation n. 5a. ΘΚΠ society > travel > travel by water > vessel, ship, or boat > equipment of vessel > navigational aids > [noun] > compass > variation north-easting1555 variation of the compass, (lodestone,) or needle?a1560 norwesting1561 north-westing1571 variation1595 declination1625 magnetic variation1696 variation of the variation1706 magnetic declination1787 1696 E. Harrison Idea Longitudinis v. 26 I desire the Ingenious Seamen [sic], that the knowledge of Magnetick Variation, may be always in his great Esteem. 1794 R. Walker Memorial to Board of Longitude 3 I..constructed an instrument for the purpose of shewing the quantity of the magnetic variation in all latitudes and longitudes, at any time of the day when the sun was visible, without making any use of the horizon, or any calculation whatever. 1854 in E. K. Kane Arctic Explor. (1856) II. 349 The latitude of our camp this night was 78°44′; and the magnetic variation to-day was 111°S.W. 1991 Motorboat & Yachting June 83/3 The plotting head incorporates correction for magnetic variation on a similar principle to a Breton Plotter. 2. Geology and Meteorology. A change (over time or space) in the earth's magnetic field. ΘΚΠ the world > matter > physics > electromagnetic radiation > magnetism > earth magnetism > [noun] > local variation magnetic anomaly1899 magnetic variation1937 1937 Proc. Imperial Acad. (Tokyo) 13 34 (heading) Sudden magnetic variation during the volcanic activity of Asamayama. 1965 A. Holmes Princ. Physical Geol. (rev. ed.) xxvii. 989 The main field is constantly changing at easily measurable rates. The secular magnetic variations, as they are called, are recorded at various observatories where the details necessary to determine the total magnetic field and its parts are continuously measured. 1984 Jrnl. Geophysical Res. 89 8335/1 Magnetic variation measurements offer an effective reconnaissance tool for rapidly identifying the spatial behaviour of large scale electrical current systems in the lithosphere. This is a new entry (OED Third Edition, March 2000; most recently modified version published online March 2022). < n.1696
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