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Eng ID | Term | Definition |
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2741 | left bank | Of a RIVER, the BANK of the left-hand side as one proceeds downstream. |
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2742 | left-right indicator | An instrument indicating the orthogonal distance of a position from a pre-defined track. |
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2743 | leg | Each straight section of a TRAVERSE. One part of a craft's TRACK consisting of a single COURSE line. |
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2744 | legend | A description, explanation, table of SYMBOLS, and other information, printed on a MAP or CHART to provide a better understanding and inter... more |
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2745 | length correction (tape) | See TAPE: LENGTH CORRECTION. |
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2746 | lens | A plane, convex, or concave combination of glass or transparent material surfaces adapted for changing the direction of LIGHT RAYS to enlarg... more |
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2747 | lens axis | See AXIS OF LENS. |
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2748 | lens distortion | See DISTORTION. |
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2749 | lens element | One LENS of a complex LENS SYSTEM. |
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2750 | lens system | The combination of two or more LENSES placed in series on the same PRINCIPAL AXIS. |
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2751 | levee | A depositional natural EMBANKMENT bordering a CANYON, VALLEY or SEA CHANNEL on the ocean floor. |
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2752 | level | A horizontal plane or line; especially, such a plane taken as a basis for the measurement of ELEVATION. See SEA LEVEL, MEAN SEA LEVEL, HAL... more |
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2753 | level | (v.t.). To make perfectly horizontal by means of a LEVEL. |
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2754 | level: bull's eye | See LEVEL: SPIRIT. |
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2755 | level: circular | See LEVEL: SPIRIT. |
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2756 | level: dumpy | See LEVELLING INSTRUMENT: DUMPY LEVEL. |
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2757 | level: plate | A SPIRIT LEVEL attached to the plate of a surveying instrument for the purpose of levelling the graduated CIRCLE or, indirectly, making th... more |
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2758 | level: self aligning | See LEVELLING INSTRUMENT: SELF ALIGNING LEVEL. |
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2759 | level: spirit | A small closed vessel of glass (vial), having the inside surface of its upper part curved in form; the vessel is nearly filled with a fluid ... more |
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2760 | level: striding | A SPIRIT LEVEL so mounted that it can be placed above and parallel with the HORIZONTAL AXIS of a surveying or astronomical instrument, and s... more |