Measurement of any of the magnetic elements.



Related Terms

COMPASS NORTH

The direction north as indicated by a magnetic compass; the reference direction for measurement of compass directions.

GRAIN

A unit of measure commonly used in water analysis for the measurement of impurities in water. (17.1 grains = 1 part per million

TWENTY FOOT EQUIVALENT UNIT

A unit of measurement equal to the space occupied by a standard twenty foot container. Used in stating the capacity of container vessel or storage area. One 40 ft. Container is equal to two TEU's.

BUBBLE TEST

Measurement of the largest opening in the mesh of a filter screen; determined by the pressure needed to force air or gas through the screen while it is submerged in a liquid.

MAGNETIC CIRCLE

A sphere of specified radius about the magnetic compass location to be kept free of any magnetic or electrical equipment which would interfere with the compass.

ELECTRON-BEAM CHANNELING

The technique of transporting high-energy, high-current electron beams from an accelerator to a target through a region of high-pressure gas by creating a path through the gas where the gas density may be temporarily reduced; the gas may be ionized; or a current may flow whose magnetic field focuses the electron beam on the target.

THERMOGRAPHY

The use of infrared thermography whereby temperatures of a wide variety of targets can be measured remotely and without contact. This is accomplished by measuring the infrared energy radiating from the surface of the target and converting this measurement to an equivalent surface temperature.

OBLIQUE EQUATOR

A great circle the plane of which is perpendicular to the axis of an oblique projection. An oblique equator serves as the origin for measurement of oblique latitude. On an oblique Mercator map projection, the oblique equator is the tangent great circle.

FLOAT CHAMBER

A sealed, hollow part attached to the compass card of a magnetic compass as part of the compass card assembly, to provide buoyancy to reduce the friction on the pivot bearing

MAGNETIC MERIDIAN

A line of horizontal magnetic force of the earth. A compass needle without deviation lies in the magnetic meridian.

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