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Total record count: 6269.

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	Eng ID	Term	Definition
	4041	primary radar	See RADAR.
	4042	primary tide	See TIDE.
	4043	primary tide station	See STATION: TIDE.
	4044	prime meridian	See MERIDIAN.
	4045	prime vertical	See PRIME VERTICAL CIRCLE.
	4046	prime vertical circle	The VERTICAL CIRCLE through the east and west points of the HORIZON. Often shortened to prime vertical.
	4047	priming of the tide(s)	The acceleration in the TIMES of occurrence of HIGH and LOW WATER due to changes in the relative positions of the MOON and the SUN. The oppo... more The acceleration in the TIMES of occurrence of HIGH and LOW WATER due to changes in the relative positions of the MOON and the SUN. The opposite effect is called LAGGING OF THE TIDES.
	4048	principal axis	See AXIS OF LENS.
	4049	principal distance	The perpendicular distance from the internal PERSPECTIVE CENTRE to the plane of a particular finished NEGATIVE or PRINT. This distance is e... more The perpendicular distance from the internal PERSPECTIVE CENTRE to the plane of a particular finished NEGATIVE or PRINT. This distance is equal to the CALIBRATED FOCAL LENGTH corrected for both the enlargement or reduction ratio of the film or paper shrinkage or expansion and maintains the same perspective angles at the internal PERSPECTIVE CENTRE to points on the finished NEGATIVE or PRINT, as existing in the taking CAMERA at the moment of EXPOSURE.
	4050	principal line	In PHOTOGRAMMETRY, the trace of the PRINCIPAL PLANE upon the PHOTOGRAPH, (e.g., the line through the PRINCIPAL POINT and the PHOTOGRAPH NAD... more In PHOTOGRAMMETRY, the trace of the PRINCIPAL PLANE upon the PHOTOGRAPH, (e.g., the line through the PRINCIPAL POINT and the PHOTOGRAPH NADIR).
	4051	principal meridian	See MERIDIAN.
	4052	principal parallel	See PARALLEL: PHOTOGRAPH.
	4053	principal plane	In PHOTOGRAMMETRY, the vertical plane through the internal PERSPECTIVE CENTRE containing the photograph perpendicular of a tilted PHOTOGRA... more In PHOTOGRAMMETRY, the vertical plane through the internal PERSPECTIVE CENTRE containing the photograph perpendicular of a tilted PHOTOGRAPH.
	4054	principal point	In PHOTOGRAMMETRY, the foot of the perpendicular from the interior PERSPECTIVE CENTRE to the plane of the PHOTOGRAPH (i.e. the foot of the... more In PHOTOGRAMMETRY, the foot of the perpendicular from the interior PERSPECTIVE CENTRE to the plane of the PHOTOGRAPH (i.e. the foot of the photograph perpendicular).
	4055	principal scale	See SCALE.
	4056	principal vertical circle	The VERTICAL CIRCLE through the north and south points of the HORIZON, coinciding with the CELESTIAL MERIDIAN.
	4057	print	In PHOTOGRAPHY, a copy made from a transparency by photographic means.
	4058	print: blue	A nonreproducible blue image or outline usually printed photographically on paper.
	4059	print: contact	A photographic PRINT made from either a NEGATIVE or a POSITIVE in contact with a sensitized material.
	4060	print: ozalid	A photographic contact print developed by a dry diazo process. The process produces a POSITIVE from a positive IMAGE or a NEGATIVE from a n... more A photographic contact print developed by a dry diazo process. The process produces a POSITIVE from a positive IMAGE or a NEGATIVE from a negative IMAGE.
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