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	Eng ID	Term	Definition
	1681	erecting eyepiece	See EYEPIECE.
	1682	erg	The unit of energy or work in the CGS SYSTEM.
	1683	erosion	The general process of the wearing away of ROCKS and SOIL at the EARTH's surface by natural agencies.
	1684	error	Difference between a measured value and the correct or true value. Errors can be categorised as systematic or random errors.
	1685	error: absolute	Absolute deviation (the value taken without regard to sign) from the corresponding true value.
	1686	error: accidental	Noise within a measurement caused by factors which vary between measurements and cannot be controlled but can be quantified by statistical m... more Noise within a measurement caused by factors which vary between measurements and cannot be controlled but can be quantified by statistical means. Also called random error; irregular error.
	1687	error: clamping	A SYSTEMATIC ERROR in OBSERVATIONS made with a REPEATING THEODOLITE caused by strains set up by the clamping devices of the instrument.
	1688	error: closing	See ERROR OF CLOSURE.
	1689	error: constant	A SYSTEMATIC ERROR which is the same in both magnitude and sign through a given series of OBSERVATIONS.
	1690	error: external	See ERROR: THEORETICAL.
	1691	error: Gaussin	DEVIATION of a MAGNETIC COMPASS due to TRANSIENT MAGNETISM which remains in a vessel's structure for short periods after the inducing force ... more DEVIATION of a MAGNETIC COMPASS due to TRANSIENT MAGNETISM which remains in a vessel's structure for short periods after the inducing force has been removed. This ERROR usually appears after a vessel has been on the same HEADING for a considerable time.
	1692	error: gross	The result of carelessness or a mistake; may be detected through repetition of the measurement. Also called blunder.
	1693	error: heeling	The change in the DEVIATION of a MAGNETIC COMPASS when a craft heels, due to the change in the position of the magnetic influences of the cr... more The change in the DEVIATION of a MAGNETIC COMPASS when a craft heels, due to the change in the position of the magnetic influences of the craft relative to the EARTH's MAGNETIC FIELD and to the COMPASS.
	1694	error: index	The INSTRUMENTAL ERROR which is constant and attributable to displacement of a VERNIER or some analogous effect.
	1695	error: instrumental (or instrument)	A SYSTEMATIC ERROR resulting from imperfections in, or faulty ADJUSTMENT of, instruments or devices used.
	1696	error: irregular	See ERROR: ACCIDENTAL.
	1697	error: mean square	The quantity whose square is equal to the sum of the squares of the individual ERRORS divided by the number of those ERRORS.
	1698	error: parallactic	An ERROR caused by personal or instrumental PARALLAX.
	1699	error: periodic	An ERROR whose AMPLITUDE and direction vary systematically with time.
	1700	error: personal	The result of the inability of an observer to perceive dimensional values exactly. Personal errors may be either random or systematic in beh... more The result of the inability of an observer to perceive dimensional values exactly. Personal errors may be either random or systematic in behaviour. See also PERSONAL EQUATION.
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