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Eng ID | Term | Definition |
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2761 | level: tilting | See LEVELLING INSTRUMENT: TILTING LEVEL. |
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2762 | level: universal | See LEVEL: SPIRIT. |
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2763 | level: Y | See LEVELLING INSTRUMENT: Y LEVEL. |
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2764 | level axis | See AXIS OF SPIRIT LEVEL. |
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2765 | level ice | SEA ICE with a flat surface which has never been hummocked. |
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2766 | levelling (or leveling) | The operation of determining differences of ELEVATION between points on the surface of the EARTH; the determination of the ELEVATION of poi... more |
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2767 | levelling: barometric | A method of determining differences of ELEVATION from differences of ATMOSPHERIC PRESSURE observed with a BAROMETER. |
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2768 | levelling: direct | The determination of differences of ELEVATION by a continuous series of short horizontal lines. Vertical distances from these lines to adjac... more |
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2769 | levelling: geodetic | SPIRIT LEVELLING of a high order of ACCURACY, usually extended over large areas, to furnish accurate VERTICAL CONTROL as a basis for the CO... more |
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2770 | levelling: indirect | The determination of differences of ELEVATION from (a) vertical angles and horizontal distances, as in TRIGONOMETRIC LEVELLING; (b) compar... more |
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2771 | levelling: reciprocal | TRIGONOMETRIC LEVELLING wherein vertical angles have been observed at both ends of the line to eliminate ERRORS. |
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2772 | levelling: spirit | The determination of ELEVATIONS of points with respect to each other or with respect to a common DATUM, by use of a LEVELLING ROD and an ins... more |
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2773 | levelling: thermometric | The determination of ELEVATIONS above SEA LEVEL from observed values of the boiling point of water. See HYPSOMETER. |
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2774 | levelling: trigonometric | The determination of differences of ELEVATIONS by means of observed vertical angles, combined with lengths of lines. |
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2775 | levelling: water | A method of obtaining relative ELEVATIONS by observing HEIGHTS with respect to the surface of a body of still water, such as a LAKE. The re... more |
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2776 | levelling instrument | An instrument designed for the accurate measurement of height differences by the process of LEVELLING. Its essential parts are a TELESCOPE ... more |
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2777 | levelling instrument: dumpy level | A LEVELLING INSTRUMENT which has its TELESCOPE permanently attached to the levelling base, either rigidly or by a hinge that can be manipul... more |
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2778 | levelling instrument: self-aligning level | A LEVEL in which a sensitive prism element inside the TELESCOPE acts on the principle of the PENDULUM and ensures that the LINE OF SIGHT is ... more |
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2779 | levelling instrument: tilting level | A LEVELLING INSTRUMENT in which the final LEVELLING of the instrument is obtained by small controlled amounts of rotation of the TELESCO... more |
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2780 | levelling instrument: Y level | A LEVELLING INSTRUMENT having the TELESCOPE, with attached SPIRIT LEVEL, supported in Y's. The TELESCOPE can be rotated about its longitudi... more |