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	Eng ID	Term	Definition
	1761	eyepiece: erecting	An EYEPIECE containing an auxiliary re-imagining system of one or two LENSES which inverts the primary IMAGE before it reaches the EYEPIECE ... more An EYEPIECE containing an auxiliary re-imagining system of one or two LENSES which inverts the primary IMAGE before it reaches the EYEPIECE proper. The device is now obsolescent, the inversion being performed by prism systems. Also called inverting eyepiece.
	1762	eyepiece micrometer	See MICROMETER: OCULAR.
	1763	face(s) of theodolite	Either of the two positions, 'face left' (F.L.) and 'face right' (F.R.) of the THEODOLITE, when OBSERVATIONS are made with the VERTICAL CI... more Either of the two positions, 'face left' (F.L.) and 'face right' (F.R.) of the THEODOLITE, when OBSERVATIONS are made with the VERTICAL CIRCLE on the left or on the right of the TELESCOPE respectively.
	1764	facility (navigational)	See AID TO NAVIGATION.
	1765	facility (port)	See HARBOUR WORKS.
	1766	facsimile	An exact reproduction or copy.
	1767	fading	Loss of strength in received SIGNALS due to temporary variations in the conditions of propagation.
	1768	Fahrenheit temperature scale	A temperature scale defined by the relationship t°F = 1.8 t°C + 32; developed by Gabriel D. Fahrenheit (1686-1736), German physicist.
	1769	fair chart	(British terminology). The final, carefully made plot of a HYDROGRAPHIC SURVEY. In contrast to the FIELD BOARD (BOAT SHEET in U.S. terminol... more (British terminology). The final, carefully made plot of a HYDROGRAPHIC SURVEY. In contrast to the FIELD BOARD (BOAT SHEET in U.S. terminology) which is a work sheet plotted during field operations from preliminary field data, the fair chart is plotted from corrected DATA and represents the official permanent record of that particular SURVEY. Also called fair sheet. It is called smooth sheet in U.S. terminology.
	1770	fair sheet	See FAIR CHART.
	1771	fair tracing	(British terminology). A paper tracing of moderate size for transferring the work from the FIELD BOARDS to the FAIR CHARTS.
	1772	fairway	That part of a RIVER, HARBOUR etc. where the main NAVIGABLE CHANNEL for vessels of larger size lies. It is also the usual course followed b... more That part of a RIVER, HARBOUR etc. where the main NAVIGABLE CHANNEL for vessels of larger size lies. It is also the usual course followed by vessels entering or leaving harbours and sometimes called “ship channel”.
	1773	fairway buoy	A BUOY marking a FAIRWAY, with safe water on both sides.
	1774	falling tide	See TIDE.
	1775	false bottom	See PHANTOM BOTTOM.
	1776	false coordinates	See COORDINATES.
	1777	false echo	See ECHO.
	1778	false horizon	See HORIZON.
	1779	false origin	See COORDINATES: FALSE.
	1780	false station	See ECCENTRIC STATION.
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