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	Eng ID	Term	Definition
	1981	gale warning	See WARNING.
	1982	Galton's sun signal	See HELIOSTAT.
	1983	galvanometer	An instrument for detecting and determining the intensity and direction of an electric current.
	1984	galvanoplasty (or galvanoplastics)	The process of coating things with metal by means of electrolysis.
	1985	gamma	Photographic term for negative contrast resulting from development, and not the contrast of the subject itself; a numerical measure of CONTR... more Photographic term for negative contrast resulting from development, and not the contrast of the subject itself; a numerical measure of CONTRAST in the development of a NEGATIVE. A small unit of MAGNETIC FIELD INTENSITY generally used in describing the EARTH's MAGNETIC FIELD. It is defined as being equal to 10-5 OERSTED.
	1986	gamma ray	See X-RAYS.
	1987	gap	A narrow break in a RIDGE or RISE.
	1988	gas chromatography	An analysis method used to determine dissolved oxygen and nitrogen content of SEA WATER.
	1989	gas field	An area in which natural gas occurs in quantities worthy of exploitation.
	1990	gat	A natural or artificial PASSAGE or CHANNEL through SHOALS or steep BANKS, or across a line of BANKS lying between two CHANNELS.
	1991	gate: hydraulic	A form of valve used to regulate the FLOW of a liquid in a pipeline, RIVER or DAM.
	1992	gauge	An instrument for measuring the size or state of anything.
	1993	gauge: depth	A general term for an instrument made to indicate DEPTH of water, especially one in which sea depths are indicated by pressure of water agai... more A general term for an instrument made to indicate DEPTH of water, especially one in which sea depths are indicated by pressure of water against a spring, or by degree of compression of air in a tube.
	1994	gauge: float	A TIDE GAUGE that is operated by a float in a long, vertical stationary box to which the TIDE is admitted through an opening in the bottom... more A TIDE GAUGE that is operated by a float in a long, vertical stationary box to which the TIDE is admitted through an opening in the bottom. Also called box gauge.
	1995	gauge: pressure	An instrument for measuring pressure. A TIDE GAUGE operated by the change in pressure at the BOTTOM of a body of water, due to the RISE an... more An instrument for measuring pressure. A TIDE GAUGE operated by the change in pressure at the BOTTOM of a body of water, due to the RISE and fall of the TIDE.
	1996	gauge: rain	Instrument for measuring the depth of water from PRECIPITATION supposed distributed over a horizontal impervious surface and not subject... more Instrument for measuring the depth of water from PRECIPITATION supposed distributed over a horizontal impervious surface and not subject to evaporation. Also written as one word.
	1997	gauge: tide	A device for measuring the HEIGHT OF TIDE. A graduated staff in a sheltered area where visual observations can be made; or it may consist of... more A device for measuring the HEIGHT OF TIDE. A graduated staff in a sheltered area where visual observations can be made; or it may consist of an elaborate recording instrument making a continuous graphic record of tide height against time. Such an instrument is usually actuated by a float in a pipe communicating with the sea through a small hole which filters out shorter waves.
	1998	gauss	The CGS unit of MAGNETIC INDUCTION.
	1999	Gaussin error	See ERROR.
	2000	gelbstoff	Yellowish organic material suspended in sea water which causes greenish colour of the sea water in coastal areas; usually transported into t... more Yellowish organic material suspended in sea water which causes greenish colour of the sea water in coastal areas; usually transported into the sea by rivers.
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