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	Eng ID	Term	Definition
	881	coherent electromagnetic wave	See WAVE: ELECTROMAGNETIC.
	882	col	A marked DEPRESSION in the summit line of a MOUNTAIN CHAIN, generally affording a PASS from one SLOPE to the other. In METEOROLOGY, a saddl... more A marked DEPRESSION in the summit line of a MOUNTAIN CHAIN, generally affording a PASS from one SLOPE to the other. In METEOROLOGY, a saddle-backed region of almost uniform pressure which appears between two DEPRESSIONS and two ANTICYCLONES arranged alternately in a cross.
	883	colatitude	The complement of the LATITUDE, or 90° minus the LATITUDE.
	884	cold front	Any non-occluded FRONT which moves in such a way that colder air replaces warmer air.
	885	cold wave	Marked cooling of the air, or the invasion of very cold air, over a large area.
	886	collector tracing	A comprehensive record of the work compiled while the HYDROGRAPHIC SURVEY is in progress.
	887	collimate	(v.t.). In physics and ASTRONOMY, to render parallel to a certain line or direction; to render parallel, as RAYS of light; to adjust the LIN... more (v.t.). In physics and ASTRONOMY, to render parallel to a certain line or direction; to render parallel, as RAYS of light; to adjust the LINE OF SIGHT of an optical instrument so that it is in the proper position relative to the other parts of the instruments. In PHOTOGRAMMETRY, to adjust the FIDUCIAL MARKS of a CAMERA so that they define the PRINCIPAL POINT.
	888	collimation: line of	The line through the OPTICAL CENTRE of the OBJECTIVE LENS of a TELESCOPE and the centre of the RETICLE. Also called LINE OF SIGHT, sight lin... more The line through the OPTICAL CENTRE of the OBJECTIVE LENS of a TELESCOPE and the centre of the RETICLE. Also called LINE OF SIGHT, sight line, pointing line or aiming line of the instrument.
	889	collimation adjustment	The process of bringing the LINE OF COLLIMATION of a TELESCOPE into close agreement with the COLLIMATION AXIS.
	890	collimation axis	The line through the OPTICAL CENTRE of the OBJECTIVE LENS perpendicular to the AXIS of ROTATION of the TELESCOPE. Also called axis of collim... more The line through the OPTICAL CENTRE of the OBJECTIVE LENS perpendicular to the AXIS of ROTATION of the TELESCOPE. Also called axis of collimation.
	891	collimation error	See ERROR OF COLLIMATION.
	892	collimator	An optical device for artificially creating a TARGET at infinite distance (a BEAM of parallel RAYS of light) used in testing and adjusting c... more An optical device for artificially creating a TARGET at infinite distance (a BEAM of parallel RAYS of light) used in testing and adjusting certain optical instruments. It usually consists of a converging LENS and a TARGET (a system or arrangement of CROSS HAIRS) placed at the principal FOCUS of the LENS.
	893	collimator: auto	A COLLIMATOR provided with a means of illuminating its CROSS HAIRS so that, when a reflecting plane is placed normal to the emergent LIGHT B... more A COLLIMATOR provided with a means of illuminating its CROSS HAIRS so that, when a reflecting plane is placed normal to the emergent LIGHT BEAM, the reflected IMAGE of the CROSS HAIRS appears to be coincident with the CROSS HAIRS themselves. This device is used in calibrating optical and mechanical instruments.
	894	collimator: vertical	A TELESCOPE so mounted that its COLLIMATION AXIS can be made to coincide with the VERTICAL (or direction of PLUMB-LINE). The vertical collim... more A TELESCOPE so mounted that its COLLIMATION AXIS can be made to coincide with the VERTICAL (or direction of PLUMB-LINE). The vertical collimator serves as an optical PLUMB-LINE, and may be designed for use in placing a MARK on the GROUND directly under an instrument or in centering an instrument directly over a MARK on the GROUND.
	895	colour of sea water	See SEA WATER.
	896	colour proof	The final proof for checking before printing utilizing all of the negatives involved to produce a copy of the final product with all of the ... more The final proof for checking before printing utilizing all of the negatives involved to produce a copy of the final product with all of the required colours. See also PROOF.
	897	colour plate	A general term for a pressplate from which any given colour is printed.
	898	colour separation	Either the process of preparing a separate drawing, engraving or negative for each colour required in the production of a chart or a photogr... more Either the process of preparing a separate drawing, engraving or negative for each colour required in the production of a chart or a photographic process or electronic scanning procedure using colour filters to separate a multi-coloured copy into separate images of each of the three primary colours.
	899	colure: equinoctial	The HOUR CIRCLE through the EQUINOXES.
	900	colure: solsticial	The HOUR CIRCLE through the SOLSTICES.
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