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Eng ID Term Definition
2741
left bank
Of a RIVER, the BANK of the left-hand side as one proceeds downstream.
2742
left-right indicator
An instrument indicating the or­thogonal distance of a position from a pre-defined track.
2743
leg
Each straight section of a TRAVERSE. One part of a craft's TRACK consisting of a single COURSE line.
2744
legend
A description, explanation, table of SYMBOLS, and other informa­tion, printed on a MAP or CHART to provide a better understanding and interp... more
A description, explanation, table of SYMBOLS, and other informa­tion, printed on a MAP or CHART to provide a better understanding and interpreta­tion of it. The TITLE of a MAP or CHART formerly was conside­red part of the legend, but this usage is obsolete.
2745
length correction (tape)
See TAPE: LENGTH CORRECTION.
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
A plane, convex, or concave combination of glass or transparent material surfaces adapted for changing the direction of LIGHT RAYS to enlarge or reduce the apparent size of objects. See ACHROMATIC LENS, APOCHROMATIC LENS, ANALLACTIC LENS, OBJECTIVE LENS, EYEPIECE, LENS ELEMENT, LENS SYSTEM, MAGNIFYING GLASS.
2747
lens axis
See AXIS OF LENS.
2748
lens distortion
See DISTORTION.
2749
lens element
One LENS of a complex LENS SYSTEM.
2750
lens system
The combination of two or more LENSES placed in series on the same PRINCIPAL AXIS.
2751
levee
A depositional natural EMBANKMENT bordering a CANYON, VALLEY or SEA CHANNEL on the ocean floor.
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, HALF... more
A horizontal plane or line; especially, such a plane taken as a basis for the measurement of ELEVATI­ON. See SEA LEVEL, MEAN SEA LEVEL, HALF TIDE LEVEL, STILL WATER LEVEL. A level tract of land; a stretch of country ap­proxi­mately horizontal and unbroken by ELEVATIONS. In SURVEYING and LEVELLING, either a SPIRIT LEVEL or a LEVELLING INSTRUMENT.
2753
level
(v.t.). To make perfectly horizontal by means of a LEVEL.
2754
level: bull's eye
See LEVEL: SPIRIT.
2755
level: circular
See LEVEL: SPIRIT.
2756
level: dumpy
See LEVELLING INSTRUMENT: DUMPY LEVEL.
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 the... more
A SPIRIT LEVEL attached to the plate of a surveying instrument for the purpose of levelling the graduated CIRCLE or, in­directly, making the VERTICAL AXIS truly vertical.
2758
level: self aligning
See LEVELLING INSTRUMENT: SELF ALIGNING LEVEL.
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
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 of low viscosity (alcohol or ether), enough free space being left for the formation of a bubble of air and gas, which will always assume a position at the top of the vessel. There are two types of spirit levels used in SURVEYING: one has the curved surface spherical in form, producing a bubble of circular outline; and is properly called a circular level (also universal level or bull's eye level). The other and much more generally used type has a vessel in the form of circular tube, the longitudinal axis of which is also circular in form. It is the type usually referred to when the term 'spirit level' is used. The spirit level is also called spirit bubble or sensitive bubble.
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
A SPIRIT LEVEL so mounted that it can be placed above and parallel with the HORIZONTAL AXIS of a surveying or astronomical instrument, and so supported that it can be used to measure the INCLINATION OF THE HORIZONTAL AXIS to the plane of the HORI­ZON. Generally, its mounting has supports in the form of inverted eyes which rest directly upon the pivots on which the TELESCOPE of the instrument rotates.