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	Eng ID	Term	Definition
	3801	phase velocity	VELOCITY, measured over a short time period, at which a particular WAVE CREST is propagated a medium.
	3802	phenomenon	(pl. phenomena). Any fact, circumstance, or experience that is apparent to the senses and that can be scientifically described or appraised;... more (pl. phenomena). Any fact, circumstance, or experience that is apparent to the senses and that can be scientifically described or appraised; as, an ECLIPSE is a PHENOMENON of ASTRONOMY.
	3803	phonometer	An instrument for measuring the intensity or FREQUENCY of SOUNDS.
	3804	phosphorescence	The production of light without sensible heat. Emission of electromagnetic RADIATION by a substance as a result of previous absorption of ... more The production of light without sensible heat. Emission of electromagnetic RADIATION by a substance as a result of previous absorption of RADIATION of shorter WAVE LENGTH. In contrast to FLUORESCENCE, the emission may continue for a considerable time after cessation of the existing IRRADIATION.
	3805	phot	The unit of ILLUMINATION in the CGS system.
	3806	photic	(adj.). Of SEA WATER, that is penetrated or influenced by sunlight.
	3807	photoalidade	A photogrammetric instrument having a telescopic ALIDADE, a plateholder, and a hinged ruling arm mounted on a tripod frame. It is used for... more A photogrammetric instrument having a telescopic ALIDADE, a plateholder, and a hinged ruling arm mounted on a tripod frame. It is used for plotting lines of direction and measuring vertical angles to selected features appearing on OBLIQUE and TERRESTRIAL PHOTOGRAPHS.
	3808	photo base	The length of the AIR BASE as represented on a PHOTOGRAPH.
	3809	photocompose	(v.t.). To combine distinct parts of chart original by photographic processes.
	3810	photocontrol point	See CONTROL POINT.
	3811	photodelineation	The DELINEATION of features on a PHOTOGRAPH. See also COMPILATION.
	3812	photoelectric pilot	A device for automatic steering in conjunction with the MAGNETIC COMPASS. Its pinnacle unit, or directive element, consists of a high-grade ... more A device for automatic steering in conjunction with the MAGNETIC COMPASS. Its pinnacle unit, or directive element, consists of a high-grade MAGNETIC COMPASS of special construction, a simple light system, and a photoelectric cell, so arranged that the slightest deviation of the vessel from its COURSE is detected and relayed to the steering engine unit.
	3813	photoengraving	A process by which PHOTOGRAPHS are reproduced on printing plates especially one in which the REPRODUCTION is in relief: opposed to PHOTOGRAV... more A process by which PHOTOGRAPHS are reproduced on printing plates especially one in which the REPRODUCTION is in relief: opposed to PHOTOGRAVURE. A PLATE so made. A PRINT from such a PLATE.
	3814	photogoniometer	An instrument for measuring angles from the true PERSPECTIVE CENTRE to points on a PHOTOGRAPH.
	3815	photogram	A survey photograph. Either of a pair of stereoscopic PHOTOGRAPHS.
	3816	photogrammetric camera	See CAMERA.
	3817	photogrammetric control	See CONTROL.
	3818	photogrammetric extension	See PHOTOTRIANGULATION.
	3819	photogrammetric survey	See SURVEY.
	3820	photogrammetry	The science or art of obtaining reliable measurements from PHOTOGRAPHS.
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