line of equal variation of the compass

См. также в других словарях:

• compass — compassable, adj. compassless, adj. /kum peuhs/, n. 1. an instrument for determining directions, as by means of a freely rotating magnetized needle that indicates magnetic north. 2. the enclosing line or limits of any area; perimeter: You can… …   Universalium

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• Vernier compass — Vernier Ver ni*er, n. [So named after the inventor, Pierre Vernier.] A short scale made to slide along the divisions of a graduated instrument, as the limb of a sextant, or the scale of a barometer, for indicating parts of divisions. It is so… …   The Collaborative International Dictionary of English

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• geomagnetic field — Magnetic field associated with the Earth. It is essentially dipolar (i.e., it has two poles, the northern and southern magnetic poles) on the Earth s surface. Away from the surface, the field becomes distorted. Most geomagnetists explain the… …   Universalium

• Underwater searches — are procedures carried out by divers in order to find a known or suspected target object or objects in a specified search area under water. There are a number of techniques in general use by Commercial, Scientific, Public service, Military, and… …   Wikipedia