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	Eng ID	Term	Definition
	121	amplitude	In ASTRONOMY, the arc of the HORIZON, between a CELESTIAL BODY at rising or setting and true east or west point. In tide terminology, the se... more In ASTRONOMY, the arc of the HORIZON, between a CELESTIAL BODY at rising or setting and true east or west point. In tide terminology, the semi-range of the HARMONIC CONSTITUENT. In physics, the maximum departure of a WAVE or other periodic PHENOMENON from the average or zero position.
	122	amplitude modulation	See MODULATION.
	123	anaglyph	A STEREOGRAM in which the two views are printed or projected superimposed in complementary colours, usually red and green. By viewing throug... more A STEREOGRAM in which the two views are printed or projected superimposed in complementary colours, usually red and green. By viewing through filter spectacles of corresponding complementary colours a STEREOSCOPIC IMAGE is formed.
	124	anaglyphic map	See under MAP.
	125	analemma	A SCALE of the SUN's daily DECLINATION drawn from TROPIC OF CANCER to TROPIC OF CAPRICORN on TERRESTRIAL GLOBES. An ORTHOGRAPHICAL PROJECTIO... more A SCALE of the SUN's daily DECLINATION drawn from TROPIC OF CANCER to TROPIC OF CAPRICORN on TERRESTRIAL GLOBES. An ORTHOGRAPHICAL PROJECTION of the sphere made on the plane of the MERIDIAN, the eye being supposed to be an infinite distance and in the east or west point of the HORIZON.
	126	anallatic lens	A convergent LENS fitted between the OBJECTIVE LENS and the DIAPHRAGM of TELESCOPES of instruments for direct measurements of distances betw... more A convergent LENS fitted between the OBJECTIVE LENS and the DIAPHRAGM of TELESCOPES of instruments for direct measurements of distances between the OPTICAL CENTRE of the instrument and a graduated staff called STADIA.
	127	analogue	The way of representing information by continuous data.
	128	analogue computer	See under COMPUTER.
	129	analytical (or analytic) photogrammetry	See under PHOTOGRAMMETRY.
	130	anastigmatic	(adj.). Free from ASTIGMATISM. Corrected for ASTIGMATISM.
	131	anchor berth	A designated area of water where a vessel, seaplane, etc. may anchor.
	132	anchorage	An area in which vessels anchor or may anchor.
	133	anchorage buoy(s)	BUOY(S) marking the limits of an ANCHORAGE.
	134	anchor buoy	A BUOY marking the position of an anchor.
	135	anchor ice	ICE which is attached to the BOTTOM, irrespective of the nature of its formation. Also called bottom ice, depth ice, ground ice, lappened ic... more ICE which is attached to the BOTTOM, irrespective of the nature of its formation. Also called bottom ice, depth ice, ground ice, lappened ice and underwater ice.
	136	anemometer	Instrument used in the measurement of wind speed or of wind speed and direction. See also ANEMOGRAPH.
	137	anemogram	Record of the ANEMOGRAPH.
	138	anemograph	An instrument which records WIND speed and direction. See also ANEMOMETER.
	139	aneroid barometer	See BAROMETER.
	140	aneroid capsule	Metallic capsule, of thin sides, partially evacuated by a fixed amount, carrying an arrangement to prevent its collapsing under ATMOSPHERIC ... more Metallic capsule, of thin sides, partially evacuated by a fixed amount, carrying an arrangement to prevent its collapsing under ATMOSPHERIC PRESSURE, and whose shape changes in accordance with changes of this pressure.
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