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	Eng ID	Term	Definition
	4801	sky-wave correction	The CORRECTION to be applied to the time difference reading of received SKY WAVES to convert it to an equivalent GROUND WAVE reading.
	4802	slack tide	See SLACK WATER.
	4803	slack water	The interval when the SPEED of the TIDAL CURRENT is very weak or zero; usually refers to the period of reversal between EBB and FLOOD curren... more The interval when the SPEED of the TIDAL CURRENT is very weak or zero; usually refers to the period of reversal between EBB and FLOOD currents. Also called slack tide.
	4804	slant distance	The straight-line distance from one point to another, as contrasted with GROUND DISTANCE. This expression is customarily used only when the ... more The straight-line distance from one point to another, as contrasted with GROUND DISTANCE. This expression is customarily used only when the straight line connecting the two points lies above the surface of the EARTH. Also called slant range.
	4805	slant range	See SLANT DISTANCE.
	4806	slave	A SLAVE STATION.
	4807	slave station	In a radio navigation system, the transmitting station controlled or triggered by the SIGNAL received from the MASTER STATION. Often shorten... more In a radio navigation system, the transmitting station controlled or triggered by the SIGNAL received from the MASTER STATION. Often shortened to slave.
	4808	slide: dark	A thin PLATE (usually metal or fibre, rigid or flexible) which, after insertion in a camera magazine, renders it light-tight.
	4809	slide (or sliding) rule	A device used for performing rapid computations involving multiplication, division, proportion, roots, and powers. It has a body like a ru... more A device used for performing rapid computations involving multiplication, division, proportion, roots, and powers. It has a body like a ruler, but with a sliding section. Both body and sliding section are graduated with numbers according to LOGARITHMIC SCALES.
	4810	slime	Soft, fine, oozy MUD or other substance of similar consistency.
	4811	slip	See DOCK.
	4812	slipway	The prepared and usually reinforced inclined surface on which keel- and bilge-blocks are laid for supporting a vessel under construction.
	4813	slope	The deepening SEAFLOOR out from the SHELF EDGE to the upper limit of the CONTINENTAL RISE, or the point where there is a general decrease in... more The deepening SEAFLOOR out from the SHELF EDGE to the upper limit of the CONTINENTAL RISE, or the point where there is a general decrease in steepness.
	4814	slope and height factor	In the measurement of distances with Tellurometer, a factor to be reckoned when reducing distances to the SPHEROID. It takes into account ... more In the measurement of distances with Tellurometer, a factor to be reckoned when reducing distances to the SPHEROID. It takes into account the mean HEIGHT of the stations (master and remote units) and the SLOPE of the line.
	4815	slope angle	The angle between a SLOPE and the horizontal.
	4816	slope correction (tape)	See TAPE: GRADE CORRECTION.
	4817	slotted-template triangulation	In PHOTOGRAMMETRY, a graphical RADIAL TRIANGULATION using slotted TEMPLATES.
	4818	slough	A minor marshland or tidal WATERWAY which usually connects other tidal areas; often more or less equivalent to a BAYOU. Quagmire, SWAMP, mir... more A minor marshland or tidal WATERWAY which usually connects other tidal areas; often more or less equivalent to a BAYOU. Quagmire, SWAMP, miry place.
	4819	sludge	Spongy whitish ice lumps, a few centimetres across; they consist of SLUSH, of snow slush and sometimes of spongy ice lumps formed on the B... more Spongy whitish ice lumps, a few centimetres across; they consist of SLUSH, of snow slush and sometimes of spongy ice lumps formed on the BOTTOM of the SEA and emerging on the surface.
	4820	sluice	Sliding gate or other contrivance for changing the level of a body of water by controlling FLOW into or out of it.
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